Bumblebee Catfish Care Guide: Tank Setup, Diet & Tank Mates

Species Overview#

The South American bumblebee catfish (Microglanis iheringi) is a small, banded bottom-dweller that has earned a quiet but loyal following in the freshwater hobby. At a glance it looks like a miniature version of a much larger predator — chunky head, downturned mouth, broad pectoral fins — but the adult tops out at roughly 3 inches, making it one of the few "novelty catfish" that actually fits in a community tank. The yellow-and-dark-brown banding gives the species its common name and is the reason most hobbyists pick one out at the store in the first place.

The catch is that almost everything about this fish happens out of sight. Bumblebee catfish are strictly nocturnal, spend daylight hours wedged into caves or under driftwood, and hunt by scent rather than sight. Setting up the tank to suit those habits is the difference between a fish you barely see and one that becomes the tank's most interesting after-hours resident.

Adult size

2.5-3 in (6-7 cm)

Lifespan

4-5 years

Min tank

20 gallons

Temperament

Peaceful but predatory

Difficulty

Beginner-Intermediate

Diet

Carnivore

Natural Habitat#

Microglanis iheringi is native to the river drainages of northern South America, with confirmed populations in Venezuela, Colombia, and parts of Brazil. The fish lives in fast-moving, rocky tributaries and streams — the kind of clear, well-oxygenated water that runs over cobble and through tangles of submerged root and leaf litter. Daytime is spent under cover; the fish emerges at dusk to forage along the substrate for insect larvae, small crustaceans, and anything else that fits in its mouth.

These habitats run on the soft, slightly acidic side, with moderate flow and temperatures in the low-to-mid 70s Fahrenheit. Replicating that oxygen level and structural complexity at home matters more than chasing exact pH numbers — the species adapts well to a range of tap-water chemistries as long as oxygen and shelter are abundant.

Appearance & Size#

Adults reach roughly 2.5 to 3 inches and stay there. The body is stocky and slightly flattened along the bottom, the head is broad with three pairs of barbels (sensory whiskers) around the mouth, and the coloration is the species' calling card: alternating yellow and dark brown bands that resemble a bumblebee. The bands are most vivid on juveniles and tend to deepen with age and good diet.

This is also where the most important confusion in the hobby starts. Asian bumblebee catfish (Pseudomystus siamensis) are sold under the same common name and look strikingly similar at small sizes — but they grow to 6 inches or more, are noticeably more aggressive, and need a larger tank. If the fish at the store is over 3 inches and still labeled "bumblebee catfish," it is almost certainly the Asian species, not Microglanis.

Lifespan#

Expect 4 to 5 years from a healthy bumblebee catfish in a stable aquarium. Some individuals push past that with pristine water and a varied diet, but most do not match the decade-plus lifespans of larger catfish. Early losses almost always trace back to one of three causes: copper-based ich medication, ammonia exposure during cycling, or chronic underfeeding because the fish is being outcompeted at mealtime by faster tank mates.

Water Parameters & Tank Requirements#

Bumblebee catfish are forgiving across a wide parameter range, but they react badly to two things — copper and ammonia spikes. Build the tank around clean water, oxygenated flow, and abundant hiding spots and the rest of their care is uncomplicated.

Ideal Water Conditions#

Target temperatures of 72 to 77°F. The species tolerates a brief excursion outside that range but does best in stable mid-70s. pH should land between 6.5 and 7.5, with hardness in the 8 to 12 dGH range. Most municipal tap water in the United States falls inside these numbers without adjustment, so chasing chemistry is rarely necessary.

Ammonia and nitrite must read zero. Nitrate should stay under 30 ppm, ideally below 20 — Microglanis is more sensitive to nitrogen-cycle problems than its hardy reputation suggests, and chronic low-grade ammonia exposure shortens lifespan even when no acute symptoms appear. Test weekly and run a planted or otherwise well-cycled tank before introducing the fish.

Tank Size & Layout#

A 20-gallon tank is the practical minimum for a single bumblebee catfish, with a 29 or 40-gallon being more comfortable if you plan to add tank mates. The species does not need a huge swimming volume — it stays in the bottom third of the tank — but it does need real estate on the substrate for caves and hiding spots.

Layout should include multiple shelters: rocky caves built from slate or river stone, lengths of dark PVC pipe sized to the fish's body, ceramic spawning caves, and at least one substantial piece of driftwood with crevices underneath. Aim for at least one hide per catfish and one or two extras — providing enough cover lets the fish establish a sense of safety and emerge more readily at night. Plants like Anubias or Java fern attached to the wood add visual cover without competing for substrate space.

Filtration & Substrate#

Use a filter rated for at least the gallonage of your tank and aim for moderate flow — strong enough to keep the surface gently rippling and the substrate clear of detritus, but not so strong that the catfish struggles to hold position when it forages at night. A canister filter on a 29-gallon or larger tank, or a quality hang-on-back on a 20-gallon, gives the right combination of biological capacity and oxygenation. Sponge filters supplement well and add fry-safe filtration if you ever attempt breeding.

Substrate should be sand or fine, smooth gravel. Bumblebee catfish constantly drag their barbels along the bottom while hunting, and rough or sharp substrate wears the sensitive whiskers down over time. Pool-filter sand, fine aquarium sand, or rounded pea gravel are all good choices. Avoid sharp-edged crushed coral or jagged decorative gravel.

Diet & Feeding#

These fish are pure carnivores, and feeding them is the single most common point where new keepers go wrong — usually by feeding the wrong foods, at the wrong time, in front of the wrong tank mates.

Carnivore Feeding Strategy#

A bumblebee catfish will eat almost any meaty food that sinks. The staple should be a high-quality sinking carnivore pellet — sized for the fish's mouth and dense enough to reach the substrate before tank mates intercept it. Supplement with frozen bloodworms, frozen brine shrimp, frozen daphnia, blackworms, and the occasional chunk of raw shrimp or fish. Variety matters; a single-food diet leads to color loss and reduced energy over a year or two.

This species hunts by scent. It does not need to see food to find it — drop a frozen cube near a cave entrance and the catfish will emerge within minutes, even in low light. Lean on this behavior when you feed.

Feeding Schedule & Tips#

Feed after lights-out. Drop food into the tank just as the room goes dark, ideally near the catfish's preferred hide. This bypasses the daytime feeding chaos and gives the fish a clear shot at the food without competing with hungrier, faster tank mates.

Feed three to four times per week, not daily. Bumblebee catfish have slow metabolisms compared to active mid-water fish, and overfeeding leads to digestive bloat and water-quality problems. A well-fed catfish has a slightly rounded belly when viewed from underneath; a flat or sunken belly means it is being outcompeted and you need to either feed more or rearrange the timing. If the catfish has not eaten the food by morning, scoop out leftovers before they decay.

Tank Mates & Compatibility#

Bumblebee catfish are peaceful with anything they cannot eat, which makes the compatibility question mostly about size — both in the catfish's favor (do not house with anything that will harass it) and in the tank mates' favor (do not house with anything tiny enough to swallow).

Good Companions#

The best tank mates are peaceful mid-water and top-dwelling species that occupy the parts of the tank the catfish ignores. Larger tetras (lemon, black skirt, congo, rummy-nose, serpae) work well, as do harlequin rasboras, danios, peaceful livebearers like platies, and corydoras catfish — corys share the bottom but are diurnal and active during the catfish's downtime. Peaceful dwarf cichlids like Apistogramma and German blue rams are excellent if the tank is large enough that everyone gets territory.

Multiple bumblebee catfish can coexist in a 30-gallon or larger tank as long as each fish has its own cave. They will sometimes squabble briefly over preferred hides, but serious aggression is rare.

Species to Avoid#

Skip large or aggressive cichlids — oscars, jaguar cichlids, large Central American species — that will harass the catfish into starvation through constant intimidation. Avoid fast aggressive feeders like tiger barbs, which will not directly attack the catfish but will inhale every piece of food before it reaches the substrate. Stay away from very small nano fish and dwarf shrimp; these will simply disappear over the course of a few weeks.

Other bottom-dwellers that compete directly for cave space — territorial loaches, larger plecos, or other catfish of similar size — can also create problems if the tank is small. In a 20-gallon, keep one bumblebee catfish and pair it with mid-water species that do not compete for the substrate.

Keeping Multiple Bumblebee Catfish#

A 30-gallon or larger tank can hold two or three bumblebee catfish comfortably as long as you provide one cave per fish plus one or two extras. They are gregarious enough that conspecifics do not stress them, but they are also territorial enough that limited hides lead to one dominant fish blocking the others from feeding. Watch for one catfish consistently hogging the best cave or chasing others off — that is a sign you need to add more shelter.

Breeding Bumblebee Catfish#

Microglanis iheringi is rarely bred in home aquariums but the behavior is documented well enough to attempt. It is not a beginner project; success requires a dedicated species tank and patience.

Sexing & Conditioning#

Females are noticeably broader-bodied than males when viewed from above, particularly when conditioned for spawning. Males stay more slender and elongated. The difference is most reliable in adult fish; juveniles under 2 inches are difficult to sex visually.

Condition a potential breeding pair on a high-protein diet for several weeks: live blackworms, frozen bloodworms, and chopped earthworms multiple times per week. Both fish should develop visible weight, with the female showing a clearly rounded belly.

Spawning Setup#

Bumblebee catfish are cave spawners. Provide a tight-fitting ceramic spawning cave or a length of PVC pipe just large enough for the male to back into. A cooler-than-normal water change with conditioned water — temperature drop of 4 to 6°F — sometimes triggers spawning, mimicking the seasonal rains in the species' native range.

The male claims the cave and the female deposits eggs on the cave ceiling. The male then guards and aerates the eggs until hatching, which typically takes 4 to 7 days. Fry are tiny and require microworms, vinegar eels, or newly hatched baby brine shrimp once they begin free-swimming. Most hobbyists who report success run the spawning attempt in a dedicated 10-gallon breeding tank rather than a community setup.

Common Health Issues#

Bumblebee catfish are hardy when their basic needs are met, but they share the vulnerabilities of all scaleless and thinly-scaled catfish to medications and water-quality swings.

Ich & Skin Flukes#

Ich (Ichthyophthirius multifiliis) shows up as small white spots scattered across the body and fins, often with the fish flashing against decor. Treat by raising tank temperature gradually to 82-84°F over a few days plus aquarium salt at 1 tablespoon per 5 gallons. Many over-the-counter ich medications work, but read the label — anything with copper sulfate or warning against scaleless fish should not be used in this tank.

If you must use a stronger medication, dose at half the recommended strength and watch the catfish closely for signs of distress (rapid breathing, hanging at the surface, loss of color). Praziquantel-based treatments are safer for skin flukes than copper or formalin and are the preferred choice for Microglanis.

Bacterial Infections from Poor Water Quality#

Bacterial infections show up as red streaks on the fins or body, ulcerated patches, or a faded slime coat. The trigger is almost always a lapse in water quality — a missed water change, an ammonia spike during a tank crash, or chronic high nitrate levels above 40 ppm.

Treat by addressing the water quality first: large water change with conditioned water of matching temperature, gravel vacuum to clear decaying organics, and a filter media swap if biological capacity has crashed. For severe infections, treat with a broad-spectrum antibiotic like kanamycin in a separate hospital tank — never dose antibiotics in the display tank, where they damage the biological filter and may push the tank into a secondary mini-cycle.

Where to Buy & What to Look For#

Bumblebee catfish are not as widely stocked as bristlenose plecos or corydoras, but a good local fish store with a focus on freshwater specialty species will usually have them or can order them. The single most important question to ask at the store is which species you are actually looking at.

Finding Healthy Specimens at Your Local Fish Store#

A washed-out or pale specimen is the most common warning sign. Bumblebee catfish lose color rapidly under stress — bright lighting with no shelter, prolonged shipping, or chronic water-quality problems all bleach the bands. A fish that looks gray or dull is already in decline; pick a different specimen, or come back after the store has had the shipment for a week or two to settle.

Microglanis iheringi vs. Asian Bumblebee Catfish#

This is the most important conversation to have with the staff. Two completely different species are sold under the same common name, and the care requirements are not interchangeable.

Microglanis iheringi — the South American bumblebee catfish covered here — tops out at 3 inches, is reasonably peaceful, and fits in a 20-gallon community tank. Pseudomystus siamensis — the Asian bumblebee catfish — grows to 6 inches or more, is more aggressive, will eat small tank mates outright, and needs a 40-gallon tank as a minimum. The two look nearly identical at 2 inches, with the same yellow-and-brown banding, so visual ID at small size is unreliable.

Ask the store directly: "Is this Microglanis iheringi or Pseudomystus siamensis?" A good store will know the answer or check the supplier invoice. If the staff cannot tell you, look at the body shape — Pseudomystus has a more elongated, eel-like profile and a longer, more pointed snout, while Microglanis is stockier and shorter-bodied. When in doubt, assume the larger species and stock accordingly.

If you are looking for similar bottom-dweller catfish but want something hardier or larger, the striped raphael catfish is a popular peaceful alternative for bigger tanks. For a broader look at compatible community fish, see our freshwater fish guide, and if you are stocking a smaller tank specifically, our 20-gallon fish tank guide walks through what does and does not fit at that volume.

Quick Reference#

• Tank size: 20 gallons minimum for one; 30+ gallons for a small group
• Temperature: 72-77°F (22-25°C)
• pH: 6.5-7.5
• Hardness: 8-12 dGH
• Diet: Carnivore — sinking pellets, frozen bloodworms, brine shrimp, daphnia
• Feeding: 3-4 times per week, after lights-out
• Substrate: Sand or fine, smooth gravel — no sharp edges
• Hideouts: Mandatory — one cave per fish plus extras
• Tank mates: Mid-sized tetras, rasboras, corydoras, peaceful dwarf cichlids
• Avoid: Dwarf shrimp, nano fish under 1 inch, aggressive cichlids, fast-feeding barbs, copper medications
• Sexing: Females broader-bodied; males more slender
• Adult size: 2.5-3 inches (do not confuse with 6-inch Pseudomystus siamensis)
• Lifespan: 4-5 years
• Difficulty: Beginner-Intermediate