--- type: species title: "Endler's Livebearer Care Guide: Tank Setup, Diet & Breeding Tips" slug: "endlers-livebearer" category: "freshwater" scientificName: "Poecilia wingei" subcategory: "Livebearer" lastUpdated: "2026-04-24" readingTime: 9 url: https://www.fishstores.org/species/endlers-livebearer --- # Endler's Livebearer Care Guide: Tank Setup, Diet & Breeding Tips *Poecilia wingei* Learn how to care for Endler's livebearers — tank size, water parameters, feeding, breeding, and where to find healthy Poecilia wingei. ## Species Overview Endler's livebearer (*Poecilia wingei*) is the wild cousin of the fancy guppy — smaller, flashier, and almost entirely the work of one tiny lagoon in northeastern Venezuela. Males rarely exceed an inch and carry electric oranges, neon greens, and metallic blacks in patterns that change from one bloodline to the next. Females are plainer silver-grey and noticeably bigger. The species was scientifically described in 2005 after sitting in hobbyist tanks for decades under the catch-all label "Endler's guppy." Two things make Endlers distinct from common guppies. First, they were a separate evolutionary branch until aquarists started crossing them with *Poecilia reticulata* — and those hybrids now dominate the market. Second, the original wild population in Laguna de Patos is critically threatened by pollution and habitat loss, which makes the maintained aquarium strains genuinely important for conservation. If you care about keeping a pure strain, sourcing matters more here than for almost any other livebearer. | Field | Value | | ----------- | ------------------------------- | | Adult size | Males \~1 in / Females \~1.5 in | | Lifespan | 2–3 years | | Min tank | 10 gallons (small colony) | | Temperament | Peaceful, active | | Difficulty | Beginner | | Water | Hard, alkaline (like guppies) | ### Wild Origin & Conservation Status Endlers come from Laguna de Patos and a handful of nearby brackish-influenced lagoons on the Paria Peninsula in Venezuela. The water there is hard, alkaline, warm, and choked with algae — a soup of microorganisms that feeds the natural population. John Endler collected the species in 1975, but it took thirty years for taxonomy to catch up and assign it the *wingei* name in honor of Danish ichthyologist Øjvind Winge. The wild population is in trouble. Laguna de Patos has been impacted by sewage runoff, road construction, and the introduction of fancy guppies released from tropical fish operations in the area. The IUCN has not formally assessed *P. wingei* for the Red List, but most field surveys describe the wild stock as critically threatened or functionally extinct in parts of the original range. The pure strains kept by hobbyists today are a genetic safety net, which is why classification rules among breeders are so strict. ### Appearance & Class Designations Pure Endlers are split into two informal classes by the American Livebearer Association. **N-class** (also called "Class N") refers to fish with documented pure ancestry — no guppy genetics, ideally with collection records back to known wild lines. These are the conservation-grade animals. **P-class** is the catch-all for hybrid Endler-guppy crosses, which still display Endler-like patterns but carry guppy genes from past hybridization. P-class fish are perfectly fine pets but will not preserve the wild species. Males are the showpiece. Color patterns include the Black Bar (a vertical stripe behind the gill plate), Tiger (a series of alternating bars), Snake Chest (mosaic patterning across the breast), and Peacock (iridescent blue-green spots on the flank). Each established line has a registered name and a maintained pedigree. Females, by contrast, are almost identical across strains — silver-grey, larger, with a visible gravid spot near the anal fin. ### Size & Lifespan Males top out around 0.8 to 1.0 inches in body length. Females reach 1.2 to 1.5 inches and develop a deeper, fuller body when carrying fry. This is genuinely small — true nano-fish territory, smaller than chili rasboras and noticeably smaller than fancy guppies. Lifespan in a clean, well-fed tank runs 2 to 3 years. As with all livebearers, females generally outlive males. The tradeoff for fast reproduction is a short lifespan — a female that gives birth every 23 to 28 days for two years has put a lot of work into reproduction. ## Water Parameters & Tank Requirements Endlers tolerate a broad parameter window but reward stable, hard, alkaline water. Aim for steady numbers inside the ranges below rather than chasing perfect values, and they will thrive. ### Ideal Water Conditions Target temperature is 72–82°F, with 76–78°F as the sweet spot for breeding and color expression. Endlers slow down and become disease-prone below 70°F, and males may stop displaying entirely. Most home tanks need a small heater to hold a steady temperature year-round — even in warm climates, overnight drops can stress the fish. pH should sit between 7.0 and 8.5. Endlers come from hard, mineralized water and prefer general hardness (GH) between 10 and 30 dGH with carbonate hardness (KH) at 8 dKH or higher. If you keep your tap water on the soft, acidic side, add crushed coral or aragonite to your substrate or filter to buffer pH and add minerals. Soft acidic water is the single most common reason people report short lifespans and weak color in Endler tanks. > **Pure N-class vs. P-class hybrids** > > If you want true *Poecilia wingei*, ask the seller specifically for N-class stock with strain documentation. Generic "Endlers" at chain stores are almost always P-class hybrids that have been crossed with fancy guppies. P-class fish are fine pets but they are not the pure species and they will not preserve the wild bloodline. ### Tank Size & Stocking Density Ten gallons is the practical minimum for a small Endler colony — six to ten fish at a 3:1 female-to-male ratio. The skewed ratio matters. Males chase females constantly, and a single female with two or three males will be harassed to exhaustion. Three females per male spreads attention out and lets the females eat and rest. Endlers are nano-tank superstars, so a planted 10-gallon devoted to a single colony usually outperforms a larger mixed-community setup. If you want a bigger group or a community tank with a few compatible species, jump to a [20-gallon long](/guides/20-gallon-fish-tank) — the longer footprint matters more than the height for active swimmers. Larger tanks also dilute the fry boom that an established female colony will produce. Avoid overstocking. A 10-gallon can comfortably hold a starter group, but Endlers breed on contact and the population will double or triple in six months without intervention. Plan for that growth or set up a culling and rehoming workflow before you stock. ### Filtration & Flow A sponge filter driven by a small air pump is the gold-standard setup for Endler tanks. Sponges provide gentle biological filtration, will not suck in fry, and run silently for years on a single replacement sponge. A small hang-on-back filter works fine too, but cover the intake with a sponge pre-filter or a fine mesh — uncovered intakes will eat fry within hours of birth. Keep flow gentle. Endlers are weak swimmers and dislike strong current. If you can see your filter return creating visible movement at the back of the tank, it is too strong for an Endler-only setup. Aim for slow, broad water turnover that keeps the tank well-oxygenated without pushing fish around. Plant heavily. Java moss, hornwort, guppy grass, water sprite, and dwarf sagittaria all work. Dense plant cover gives fry hiding spots, anchors stable parameters, and makes the colors of the males stand out against the green backdrop. A barren tank with an Endler colony looks washed-out by comparison. ## Diet & Feeding Endlers are unfussy omnivores in the wild, grazing biofilm, micro-crustaceans, algae, and the occasional small insect. In captivity they accept almost any small food with enthusiasm. ### Staple Foods & Feeding Frequency Crushed flake or micro pellets twice a day in small portions covers the basics. Each feeding should be eaten in under two minutes — Endlers have tiny mouths, and food that drifts past their feeding zone hits the substrate and rots. New Life Spectrum Small Fish Formula, Bug Bites Color Enhancing, and Hikari Micro Pellets are all reasonable staples. Vary the diet across the week. A single-food rotation leads to dull color and digestive issues over time. Mix in spirulina-based flakes for the herbivore side of the diet at least twice a week. If your tank grows soft green algae on the glass, leave it — Endlers will graze it constantly. ### Live & Frozen Supplements Live or frozen foods make the difference between drab and stunning male coloration. The carotenoids in baby brine shrimp, micro worms, vinegar eels, daphnia, and grindal worms convert directly into the orange and red pigments in the males' fins and bodies. A diet of dry food alone produces faded fish; weekly live or frozen feedings produce show-quality color. Baby brine shrimp (BBS) hatched at home are the best single supplement — fry love them, adults love them, and they are cheap to culture. Frozen daphnia and frozen cyclops are good ready-to-use alternatives stocked at most fish stores. ## Tank Mates & Compatibility Endlers are peaceful and active, which makes them flexible community fish — but the size and breeding rules limit your options more than people expect. ### Best Nano-Tank Companions The strongest tank-mate options are other peaceful nano species that share the hard, alkaline water preference. Pygmy corydoras (*Corydoras pygmaeus*), chili rasboras, ember tetras, and nerite snails all coexist well with Endlers. Neocaridina shrimp — cherry shrimp and their color morphs — pair beautifully with Endlers and shrimp adults are too large for adult Endlers to eat. See the [cherry shrimp care guide](/guides/cherry-shrimp-care-guide) for setup details if you want to add them. Avoid larger or fin-nipping species. Tiger barbs, serpae tetras, and most danios will harass or outcompete Endlers at feeding time. Anything larger than 2 inches with a wide mouth is a potential predator on the smaller males. ### Species to Avoid The single biggest mistake new Endler keepers make is housing them with fancy guppies. Endlers and guppies (*Poecilia reticulata*) hybridize freely — they are close enough genetically that any female of either species will accept males of the other. Within two generations, a mixed tank becomes a P-class hybrid colony, and your pure strain is gone forever. If you want both species, run separate tanks with separate equipment to prevent accidental crossing through wet nets and shared buckets. Also avoid: bettas (will pick off males), cichlids of any size, large gouramis, and any predatory fish big enough to swallow an inch-long target. Loaches that disturb plants and substrate hard enough to dislodge fry should be skipped too. > **Do not keep with fancy guppies if pure strain matters** > > Endlers and fancy guppies (*Poecilia reticulata*) interbreed freely and produce fertile hybrids. A single accidental cross destroys the pure N-class line in your tank within two generations. If you want both species in your fishroom, use separate tanks with separate nets, buckets, and siphons. See the [fancy guppies care guide](/guides/fancy-guppies-guide) for the differences between the two species in detail. ### Same-Species Colony Keeping A single-species Endler tank is the simplest and most rewarding way to keep them. A colony of 8 to 15 fish in a planted 10 or 20-gallon shows off natural breeding behavior, courtship displays, and the full color range of the strain. Pure-strain keepers should run a dedicated tank per strain — mixing two N-class strains in the same tank produces hybrid offspring that lose the defining traits of both lines. If you keep multiple strains, label everything. Mark the tank, the net, the bucket, and the siphon hose. Cross-contamination at water-change time is the most common way breeders accidentally lose a pure line. ## Breeding Endlers are about as close to "automatic" as livebearer breeding gets. Add males and females to a clean, planted tank and you will have fry within a month, no intervention needed. ### How Livebearer Reproduction Works Endlers are ovoviviparous — eggs develop and hatch inside the female, and she gives birth to free-swimming fry. Gestation runs 23 to 28 days. The defining quirk is **superfetation**: a female can carry multiple batches of fertilized eggs at different developmental stages simultaneously. After mating once, a female can produce two or three drops of fry over several months without seeing another male. A single drop ranges from 5 to 30 fry depending on the female's age, size, and condition. Mature, well-fed females in their second year produce the largest broods. The math compounds fast: ten females in a healthy tank can produce 50+ fry per month, every month. > **Plan for the population boom** > > Endlers breed harder than most beginners expect. A starter colony of 6 fish will become 50+ within four months and 200+ within a year if every fry survives. Have a plan before you stock — local fish stores will often take excess fry as trade credit, hobbyist groups have active rehoming networks, and some keepers run a small predator (like a pea puffer in a separate tank) to manage population pressure. Do not start with Endlers and assume you can sort it out later. ### Fry Survival Tips Endler fry are larger at birth than most livebearer fry — about 6mm — and they swim and eat almost immediately. Survival rates in a planted tank are high without any human intervention. A mat of java moss or a few floating clumps of hornwort gives fry the cover they need to escape adult mouths during the critical first week. Feed fry crushed flake, powdered fry food (Hikari First Bites, Sera Micron), or live baby brine shrimp from day one. They are big enough to skip the infusoria stage that most other livebearer fry require, though infusoria certainly does not hurt. Feed small amounts three or four times a day for the first month — fry have tiny stomachs and need frequent meals to grow. A breeding box is overkill in a planted tank but useful if you are running a bare-bottom growout setup or trying to maximize survival from a specific pairing for line breeding. Confine the female only when she shows clear signs of impending birth (heavy gravid spot, squared-off belly) and release her back to the colony immediately after she drops. ### Maintaining Pure Strains Strain maintenance for N-class breeders comes down to one rule: no contact with other Endler strains and absolutely no contact with fancy guppies. Run one strain per tank. Use dedicated equipment per tank. Rinse nets in a bleach solution between tanks if you must reuse them. Cull rigorously. Even within a pure strain, individual fry will display off-type traits — mismatched patterns, wrong body shape, fin defects. Pure-strain breeders remove off-type fry early and breed only from fish that show the defining traits of the line. Without culling, even a clean strain drifts within a few generations. Most ALA-affiliated breeders publish their strain standards online, and reading those standards before you stock your tank is the best way to learn what to keep and what to remove. ## Common Health Issues Endlers are hardy, but their small size means problems escalate fast — a disease that an adult angelfish would shrug off can wipe out an Endler colony in days. ### Disease Susceptibility **Ich** (*Ichthyophthirius multifiliis*) shows as white salt-grain spots on the body and fins. It is the most common disease in any new Endler tank, usually triggered by a temperature drop or shipping stress. Treat with heat (raise to 82°F over 24 hours) and aquarium salt at hobbyist doses, or use a copper-free ich medication if salt and heat alone do not clear it within a week. **Velvet** (*Oodinium*) is more dangerous and easier to miss. The defining symptom is a fine gold-dust shimmer across the body, best seen with a flashlight from above the tank. Velvet kills faster than ich. Treat with copper-based medication in a quarantine tank — never in the display if you keep shrimp or snails, since copper is lethal to invertebrates. **Columnaris** (*Flavobacterium columnare*) presents as cottony white patches on the mouth, fins, or body. It is bacterial, not parasitic, and kills within days at warm temperatures. Drop temperature to the low 70s, treat with a broad-spectrum antibiotic, and identify the stressor (often poor water quality or aggression). ### Wasting & Stress Signs Watch for clamped fins, faded male coloration, hanging at the surface, and loss of appetite. These are general stress indicators that point at water quality issues 80% of the time. Test ammonia, nitrite, and nitrate immediately when you notice symptoms — anything above zero on ammonia or nitrite calls for an emergency 30% water change with temperature-matched, dechlorinated water. Bloat from overfeeding is the other common Endler issue. Their tiny stomachs cannot handle large meals, and a fish stuffed with flake will float at an awkward angle for days. Skip feedings entirely for 48 hours, then resume with smaller portions. ## Where to Buy & What to Look For Sourcing is everything with Endlers. The wrong source will sell you P-class hybrids labeled as Endlers, or worse, sick fish from an under-cycled holding tank. ### LFS vs. Online Sourcing Pure N-class Endlers are rare in chain pet stores. The fish sold under the "Endler" label at big-box stores are almost always P-class hybrids — pretty fish, but not the pure species. A serious local fish store will know the difference and can often tell you the source breeder. If your LFS staff cannot tell you whether their Endlers are N-class or P-class, assume P-class. For verified pure strains, your best options are dedicated livebearer breeders, ALA-affiliated members, and aquarium club auctions. Many breeders ship overnight nationwide via insulated boxes with heat packs. Online specialty sellers like Aquatic Arts and Wet Spot Tropical Fish carry rotating strains with documented provenance. If you are in a metro area, regional aquarium club meetings often have Endler keepers willing to share or trade fry from their colonies. ### Healthy Fish Checklist ### What to look for when buying Endler's livebearers - [ ] Active swimming throughout the tank — not hanging at the surface or sitting on the substrate - [ ] Vivid, sharp male coloration with no faded patches or graying - [ ] Intact, fully-erect fins — no clamped dorsal or torn caudal - [ ] Clear, alert eyes with no cloudiness or pop-eye - [ ] No visible white spots, gold dust, or cottony patches anywhere in the tank - [ ] No dead fish in the same system or adjacent shared-water tanks - [ ] Seller can tell you whether fish are N-class or P-class - [ ] Body proportions look right — chunky females, slim males, no clamped or hollow bellies When you bring your new Endlers home, drip-acclimate over 30 to 45 minutes. Endlers are sensitive to fast pH and hardness shifts, and a dump-and-pour introduction can trigger shock that shows up days later. See our [acclimation guide](/guides/how-to-acclimate-fish) for the step-by-step method. For more on cycling and freshwater setup before you stock, the [freshwater fish guide](/guides/freshwater-fish) walks through the nitrogen cycle and tank prep that should be in place before any livestock arrives. ## Quick Reference - **Tank size:** 10 gallons minimum for a colony of 6–10; 20-gallon long for larger groups - **Temperature:** 72–82°F (target 76–78°F) - **pH:** 7.0–8.5 (hard, alkaline water) - **Hardness:** 10–30 dGH, KH 8+ - **Diet:** Omnivore — micro pellets, crushed flake, frozen daphnia, baby brine shrimp - **Filtration:** Sponge filter or pre-filtered HOB; gentle flow - **Tank mates:** Pygmy corydoras, chili rasboras, ember tetras, nerite snails, neocaridina shrimp - **Avoid:** Fancy guppies (hybridize), bettas, cichlids, fin-nippers, large predators - **Sex ratio:** 3 females per male - **Breeding interval:** Every 23–28 days, 5–30 fry per drop - **Lifespan:** 2–3 years - **Difficulty:** Beginner (with sourcing caveat for N-class purity) ## Frequently Asked Questions ### How big do Endler's livebearers get? Males reach approximately 1 inch; females grow slightly larger at up to 1.5 inches. Their small size makes them ideal for nano tanks as small as 10 gallons, where a colony of 6–10 fish can thrive comfortably. ### Can Endler's livebearers live with guppies? Technically yes, but it's strongly discouraged — they interbreed freely, producing hybrid offspring that dilute pure Poecilia wingei strains. Keep N-class Endlers in a species-only or carefully curated community tank to preserve genetic integrity. ### How often do Endler's livebearers breed? Females give birth roughly every 23–28 days due to superfetation (storing multiple batches of fertilized eggs simultaneously). A single female can produce 5–30 fry per drop, so population growth in a small tank can be rapid. ### What do Endler's livebearer fry eat? Fry are large enough at birth to accept finely crushed flake food, powdered fry food, and infusoria. Baby brine shrimp nauplii are an excellent growth food. Dense planting provides cover and naturally occurring microorganisms that supplement early feeding. ### Are Endler's livebearers hardy for beginners? Yes — they tolerate a wide pH range (7.0–8.5) and adapt to most conditioned tap water. Their main vulnerability is temperature drops below 70°F and poor water quality. A cycled tank with a sponge filter and regular water changes suits them well. --- *Source: [FishStores.org](https://www.fishstores.org/species/endlers-livebearer)* *Last updated: April 24, 2026*