--- type: species title: "Keyhole Cichlid Care Guide: The Peaceful Cichlid Perfect for Community Tanks" slug: "keyhole-cichlid" category: "freshwater" scientificName: "Cleithracara maronii" subcategory: "South American Cichlid" lastUpdated: "2026-04-24" readingTime: 10 url: https://www.fishstores.org/species/keyhole-cichlid --- # Keyhole Cichlid Care Guide: The Peaceful Cichlid Perfect for Community Tanks *Cleithracara maronii* Learn how to keep Keyhole Cichlids (Cleithracara maronii) — water params, tank mates, diet, breeding tips, and where to buy healthy fish. ## Species Overview The Keyhole Cichlid (*Cleithracara maronii*) earned its common name from the dark, keyhole-shaped blotch on its flank — but the fish has earned its reputation in the hobby for something else entirely. It is one of the few cichlids you can drop into a planted community tank with rummy nose tetras and corydoras and reasonably expect everyone to get along. For keepers who want the parental behavior and pair-bonding of cichlids without the bulldozer temperament, the Keyhole is the answer. Found across the slow, tannin-stained streams of the Orinoco basin and Trinidad, this fish has spent millions of years evolving as a quiet, watchful predator of small invertebrates rather than a brawler. That natural disposition carries straight through to captivity. A pair of Keyholes will hover near driftwood, dart into cover when startled, and only really assert themselves when defending eggs. They are shy enough that a bare, brightly lit tank will leave them hiding all day — and confident enough in a properly aquascaped setup that they become one of the most rewarding cichlids to watch. | Field | Value | | ----------- | --------------------- | | Adult size | 4-5 in (10-12 cm) | | Lifespan | 8-10 years | | Min tank | 30 gallons | | Temperament | Peaceful | | Difficulty | Beginner-Intermediate | | Diet | Omnivore | ### Natural Habitat Keyhole Cichlids inhabit the slow-moving, blackwater tributaries of the Orinoco River in Venezuela and the coastal river systems of Trinidad and the Guianas. The water in these habitats is stained the color of weak tea by tannins leaching from leaf litter and decaying wood, with a pH that often dips below 6.0 and minerals so dilute that conductivity meters barely register a reading. In the wild, they stick to shaded margins thick with submerged roots, fallen branches, and leaf litter. They forage on small crustaceans, insect larvae, and detritus along the substrate. Despite this softwater origin, captive-bred Keyholes have been raised in standard aquarium water for decades, which has made them surprisingly forgiving of harder, more neutral conditions than their natural habitat would suggest. ### Appearance and the "Keyhole" Marking Adult Keyholes wear a tan to creamy-gold base color with subtle iridescence under good lighting. The defining feature is a dark, vaguely keyhole-shaped blotch positioned just below the dorsal fin on the upper flank — a marking that gives the species both its common name and an instant ID at the store. A faint stripe runs through the eye, and the unpaired fins often pick up amber and red highlights along their edges. The body color is a live readout of the fish's mood. A relaxed, well-acclimated Keyhole shows a soft cream tone with the keyhole marking clearly defined. A stressed or recently shipped fish darkens dramatically, sometimes turning almost charcoal across the entire body, with the keyhole nearly disappearing into the surrounding pigment. Use this as a diagnostic — a Keyhole that stays dark for more than a day or two after acclimation is telling you something is off in the tank. Adults typically top out around 4 inches, with exceptional specimens reaching 5 inches in roomy, well-fed setups. ### Lifespan and Temperament Well-kept Keyholes routinely live 8 to 10 years in captivity, which is on the long end for a fish this size. The combination of small adult size and long lifespan rewards keepers who invest in a proper setup — you will be looking at the same pair across a decade. Temperament is where this fish breaks the mold. Where most South American cichlids guard territory aggressively, defend a wide perimeter, or actively chase tank mates, Keyholes do almost none of that. A healthy pair forms a strong bond, picks a small corner of the tank for spawning, and otherwise behaves more like a large, deliberate gourami than a cichlid. They are slow, methodical eaters and famously shy in sparse setups. > **One of the few peaceful cichlids** > > Keyhole Cichlids are genuinely community-safe with appropriately sized fish — a rare trait in the cichlid family. They will not chase rummy nose tetras around the tank, will not dig up your plants, and will not turn into a tyrant after spawning. If you want cichlid behavior in a peaceful community, this is the fish. ## Water Parameters & Tank Requirements Get the tank dialed in before the fish arrive. Keyholes are tolerant of a range of conditions, but they are not bulletproof — ammonia spikes and rapid swings will stress them faster than they will most community tetras. ### Ideal Water Parameters Aim for the middle of the species' tolerance range rather than the extremes. The numbers below cover the conditions Keyholes thrive in across both wild-caught and captive-bred stock. ### Keyhole Cichlid Water Parameters | Parameter | Target | Notes | | -------------- | ----------------- | -------------------------------------------------- | | Temperature | 72-82°F (22-28°C) | 76-78°F is the sweet spot for general keeping | | pH | 6.0-7.5 | Captive-bred specimens tolerate up to 7.8 | | Hardness (dGH) | 5-12 dGH | Soft to moderately hard; avoid very hard tap water | | Ammonia | 0 ppm | Sensitive to any detectable level | | Nitrite | 0 ppm | Must be zero before adding fish | | Nitrate | \<20 ppm | Weekly water changes keep this in check | If your tap water runs hard and alkaline, captive-bred Keyholes from a [local fish store](/guides/freshwater-fish) almost always handle it without issue. Wild-caught specimens are a different story — they need a softer, more acidic environment to settle in long-term. ### Tank Size and Layout A 30-gallon tank is the practical minimum for a single pair. Bump that to 40 or 55 gallons if you are running a community with tetras, corys, and other tankmates. Footprint matters more than height — Keyholes patrol the lower two-thirds of the water column and appreciate floor space. Aquascape with cover in mind. Driftwood, rock piles, and dense planting (Amazon swords, Java fern, Anubias attached to wood) give them visual breaks they can retreat behind when startled. A layer of Indian almond leaves or oak leaves on the substrate releases tannins that lower pH gently and recreates the leaf litter of their native streams. Subdued lighting — either dim LED or floating plants providing shade — coaxes them out of hiding far faster than bright, open setups. > **Shy fish need hideouts** > > A Keyhole in a sparse, brightly lit tank will spend most of its day hidden and lose color. Build the aquascape with sight breaks every 6 inches — driftwood angled across the tank, dense plant clusters, and shaded corners. A well-planted Keyhole tank has fish you actually see. ### Filtration and Flow Keyholes evolved in slow, blackwater streams and prefer low to moderate flow. Avoid powerful canister returns aimed straight across the tank — a baffled hang-on-back filter or a sponge filter is better suited to their swimming style. Sponge filters double as safe filtration during fry-rearing, since they will not suck up free-swimming fry. Stable parameters matter more than the absolute filter type. Keyholes are sensitive to ammonia spikes and respond poorly to neglected tanks — a properly cycled system with consistent weekly water changes outperforms an oversized filter on a tank that gets serviced sporadically. [Cycle the tank fully](/guides/freshwater-fish) before the fish go in. ## Diet & Feeding Keyholes are unfussy omnivores that accept dry, frozen, and live foods. The catch — they are slow, deliberate feeders that get out-competed by faster fish like danios or larger tetras. Pace your feedings accordingly. ### Staple Foods A high-quality cichlid pellet or sinking community pellet forms the daily base. Hikari Micro Pellets and New Life Spectrum Community Formula are reliable choices that Keyholes accept readily. The pellet should be small enough to fit in their mouth without difficulty — they are not the snappy, aggressive feeders that larger cichlids are, and oversized food gets ignored. Feed twice daily, small portions each time. A meal that disappears within two to three minutes is the right amount. Anything still floating or settling on the substrate after five minutes is overfeeding. ### Live and Frozen Supplements Rotate in frozen bloodworms, brine shrimp, daphnia, or mysis shrimp two to three times per week. These supplements maintain color, fund egg production in females, and trigger spawning behavior in bonded pairs. Live foods — especially blackworms and freshly hatched brine shrimp — are excellent conditioning foods if you want to encourage breeding. Avoid feeder fish and beef heart. Both are unnecessary for a fish this size and create more water quality problems than they solve. ## Tank Mates & Compatibility The Keyhole's peaceful disposition opens the door to a true community tank — but their slow feeding and shy nature also makes them vulnerable to the wrong tank mates. ### Ideal Community Partners Best matches are small to medium peaceful species that share similar water parameters and feeding pace. Strong choices include: - **Tetras:** Rummy nose, cardinal, neon, lemon, and black phantom tetras - **Catfish:** Corydoras (sterbai, panda, bronze), bristlenose plecos - **Other dwarf cichlids:** [Bolivian rams](/species/bolivian-ram) and [German blue rams](/species/blue-ram) coexist if the tank is large enough (40+ gallons) and well-divided - **Surface fish:** Hatchetfish, pencilfish, marble hatchets - **Rasboras:** Harlequin, espei, and chili rasboras Stick to fish that occupy different parts of the water column — surface schoolers up top, Keyholes in the middle and lower regions, corys patrolling the substrate. This minimizes feeding competition and gives the Keyholes the calm visual environment they need. ### Species to Avoid Skip aggressive or boisterous tank mates. Specifically: - **Large cichlids:** Oscars, Jack Dempseys, convicts, Salvini cichlids — Keyholes will be bullied or killed - **Fin nippers:** Tiger barbs, serpae tetras, black skirt tetras in small groups - **Aggressive feeders:** Large danios, silver dollars in cramped tanks — they outcompete Keyholes at meal time - **Very small invertebrates:** Juvenile cherry shrimp and snail-pest cleaners may become snacks > **Slow eaters get starved out** > > Keyholes are deliberate, methodical feeders. Pair them with fast, aggressive feeders like giant danios or large barbs and the Keyholes will lose every meal. If your community already includes pushy eaters, target-feed the Keyholes with a turkey baster or pipette near their preferred hideout. The shy Keyhole that "won't compete aggressively" needs a feeding strategy, not just hope. ### Plants and Invertebrates Keyholes are plant-safe — they do not dig up established plants, do not eat foliage, and do not uproot crypts the way bigger Geophagus relatives might. Adult amano shrimp in heavily planted tanks usually go untouched, but smaller cherry shrimp and any juveniles are at risk. Snails (mystery snails, nerites) are safe. ## Breeding Keyhole Cichlids Keyholes are open spawners with strong biparental care, and they breed readily once a bonded pair forms. Watching a pair tend a clutch of eggs is one of the highlights of keeping this species. ### Sexing and Pair Formation Sexual dimorphism is subtle. Males grow slightly larger and develop more pointed dorsal and anal fin tips as they mature. Females are a touch rounder in the body and shorter-finned. The differences are not always obvious until the fish reach 3+ inches. The reliable approach to getting a pair is buying a group of six juveniles and letting them pair off naturally over the following months. Once a pair forms, the other four can usually stay in the tank — Keyholes do not turn aggressive toward conspecifics the way more typical cichlids do. If you only want the pair, the others can be rehomed. ### Spawning Behavior and Fry Care Bonded pairs spawn on a flat surface — a smooth rock, a piece of slate, or a large Anubias leaf. The female deposits 100 to 200 eggs in neat rows, and the male follows behind to fertilize them. Both parents then take turns fanning the clutch and standing guard. At 78°F, eggs typically hatch within 48 to 72 hours. Wrigglers stay in a parent-dug pit for another 4 to 5 days before becoming free-swimming. Once the fry are mobile, the parents lead them around the tank in tight schools, herding stragglers and chasing off any tank mate that approaches. Feed fry on a rotation of live baby brine shrimp, microworms, and finely powdered fry food. Survival rates are high when the parents are left undisturbed — they are genuinely excellent parents and rarely eat their own eggs after the first one or two spawns. If you want to maximize fry yield, perform water changes with extra care during the first two weeks and avoid moving any decor near the spawning site. > **Great parents — let them parent** > > Unlike many cichlid species, Keyhole pairs actively raise their fry rather than abandoning them. Resist the urge to pull the eggs to a separate tank. Leave them with the parents, dim the lights slightly, and you will get to watch a fascinating parental sequence that lasts 3-4 weeks until the fry can fend for themselves. ## Common Health Issues Keyholes are generally hardy, but two issues come up often enough to be worth flagging. ### Ich and Stress-Related Disease Ich (*Ichthyophthirius multifiliis*) presents as small white spots on the body and fins. It is most common after temperature swings, shipping stress, or the introduction of new fish. The standard treatment is gradually raising tank temperature to 86°F over 24 hours and holding for 10 to 14 days, with optional ich-X medication for stubborn cases. A note specific to Keyholes — they tolerate aquarium salt poorly compared to many freshwater species. Avoid salt-based ich treatments and stick with the heat method or a salt-free medication like ich-X. ### Hole-in-the-Head (HITH) Hole-in-the-head disease appears as small pits and lesions on the head and along the lateral line. In Keyholes, it is most often linked to two factors: nutritional deficiency from a monotonous flake-only diet, and overuse of activated carbon in filtration that strips trace minerals from the water. Prevention is straightforward — feed a varied diet that includes frozen and live foods, run activated carbon only when needed (after medication, for clearing tannins) rather than continuously, and keep nitrates below 20 ppm. Treatment for active cases involves Metronidazole-based food or treatment in a quarantine tank. ## Where to Buy & What to Look For Keyhole Cichlids are a regular but not abundant species at most local fish stores. Captive-bred stock is widely available and dramatically more reliable than wild-caught fish. ### Finding Healthy Specimens at Your Local Fish Store Health checks before you buy save weeks of treatment later. Walk past the tank, then come back and watch for a couple of minutes before making a decision. ### What to Check Before Buying a Keyhole Cichlid - [ ] Active swimming with no clamped fins or listless drifting near the substrate - [ ] Visible keyhole marking on the flank — washed-out or nearly invisible markings indicate stress or poor lighting - [ ] Body color in the cream-to-tan range, not solid charcoal (dark color = sustained stress) - [ ] No pits or lesions on the head or along the lateral line (signs of HITH) - [ ] Clear eyes with no cloudiness, swelling, or pop-eye - [ ] Intact, full fins with no fraying or white edges - [ ] No white spots, fungus, or excess slime coating - [ ] Eating in the store tank — ask the staff to feed the fish while you watch - [ ] Tank water is clean and the species is in a tank with appropriate, peaceful tank mates ### Online vs. LFS Sourcing Captive-bred Keyholes typically run $6 to $15 per fish at a local store, with juveniles at the lower end and breeding-size adults higher. Wild-caught specimens can cost more but are not worth the increased acclimation difficulty for most keepers — they need significantly softer, more acidic water to thrive long-term and ship poorly. Online vendors offer a wider selection but with the standard tradeoffs: shipping stress, no chance to inspect the fish before purchase, and a higher acclimation curve. For a species this widely captive-bred, a good local store almost always wins on net cost and survival rate. > **Buy Local** > > A healthy Keyhole at a local fish store is a fish you can watch eat, watch swim, and inspect for health markers in person. That single advantage outweighs the broader selection and lower headline prices of online vendors. For a [community-safe cichlid](/guides/freshwater-fish) you want to keep for a decade, start local. ### Acclimation Drip acclimation works best for Keyholes — float the bag for 15 to 20 minutes to match temperature, then drip 1 to 2 drops per second from the tank into the bag for 45 to 60 minutes before transferring the fish (no bag water) into the tank. For more on the process, see our guide to [acclimating new fish](/guides/how-to-acclimate-fish). Plan to keep the lights dim for the first 24 hours and avoid feeding for the first day. Expect the fish to spend the first two to three days hiding — this is normal Keyhole behavior in a new environment. A fish that has not appeared by the end of the first week and has not eaten is a sign to test the water and check for stressors. ## Quick Reference A condensed summary for the keepers who want one screen to bookmark. - **Tank size:** 30 gallons minimum for a pair; 40-55+ gallons for community - **Temperature:** 72-82°F (76-78°F sweet spot) - **pH:** 6.0-7.5 - **Hardness:** 5-12 dGH - **Diet:** Omnivore — pellets, frozen bloodworms, brine shrimp, daphnia - **Tank mates:** Tetras, corydoras, peaceful dwarf cichlids, surface schoolers - **Avoid:** Aggressive cichlids, fin nippers, fast competing feeders - **Difficulty:** Beginner-Intermediate - **Lifespan:** 8-10 years - **Where to start:** Captive-bred juveniles from a [local fish store](/near-me), in a planted [20-gallon-plus tank setup](/guides/20-gallon-fish-tank) sized to 30+ for a pair ## Frequently Asked Questions ### How big do keyhole cichlids get? Keyhole cichlids reach approximately 3-4 inches (7-10 cm) at full maturity, making them one of the smaller South American cichlids. Their modest size makes a 30-gallon tank sufficient for a breeding pair in a well-planted setup. ### Are keyhole cichlids aggressive? Keyhole cichlids are exceptionally peaceful for cichlids and rarely show aggression toward tank mates. They may become mildly territorial when guarding eggs or fry, but this behavior is brief and rarely causes harm to other fish in a properly sized tank. ### What pH do keyhole cichlids need? Keyhole cichlids thrive in a pH range of 6.0-7.5. While they originate from soft, acidic blackwater habitats, captive-bred specimens adapt well to neutral tap water. Avoid hard, alkaline water above pH 7.8 for long-term health. ### Can keyhole cichlids live with shrimp? Adult dwarf shrimp (cherry shrimp, amano shrimp) are at moderate risk — keyhole cichlids may pick off small or juvenile shrimp. Larger amano shrimp in heavily planted tanks often coexist, but a dedicated shrimp tank is safer for breeding colonies. ### How do I breed keyhole cichlids? Condition a pair with live or frozen foods, maintain water at 78-80°F, and provide flat stones or broad leaves as spawning sites. Both parents actively guard eggs and fry. Avoid disturbing the tank during spawning; fry become free-swimming within 5-7 days. --- *Source: [FishStores.org](https://www.fishstores.org/species/keyhole-cichlid)* *Last updated: April 24, 2026*