Eclipse Catfish: Species Profile, Care, and Tank Setup

Dark-bodied, often melanistic bagrid catfish imported from South and Southeast Asia are sold under a trade name rather than a formally recognized species designation in major ichthyological databases. Most fish sold under that label turn out to be the Asian Sun Catfish (Horabagrus brachysoma) or a closely related bagrid variant, both native to river systems in the Western Ghats of Kerala, India. Your first move is to confirm what the fish actually is before choosing a tank size or diet, because the name floats between species.

What follows covers how the name circulates, how to separate the fish from the often-confused Sun Catfish, and what it takes to keep one healthy long term. By the final section, you’ll know how to size a tank, set water parameters, pick safe companions, and catch stress before it tips into a health crisis.

The Name Behind Eclipse Catfish and What It Actually Refers To

Walk into any fish room and you’ll see L-numbers, “DA” prefixes, and a parade of trade-only names that never appear in a scientific paper. “Eclipse” fits that pattern, used to sell a fish that looks dark, almost blackened, like a body caught in shadow. The label sticks because hobbyists remember a moody catfish with a large dark shoulder patch more easily than a Latin name on a tag.

Where “Eclipse” Comes From as a Trade Name

Exporters in India, Sri Lanka, and Thailand routinely assign creative names to mixed shipments long before taxonomists confirm what is in the box. Black morphs of Horabagrus brachysoma, juveniles of various Bagridae members, and even stressed specimens that have temporarily darkened can all end up stamped “Eclipse.” The word sells the look; the ichthyology comes later, if at all.

Why the Underlying Species Matters More Than the Label

No database entry exists for “Eclipse Catfish” because no such species is recognized. Scientific fish naming is governed by the International Code of Zoological Nomenclature, and only published, peer-reviewed descriptions earn a place in that system. When a store tank shows a black bagrid, your cleanest path to a real ID runs through body shape, fin profile, and the dark shoulder patch Horabagrus species carry, not the trade sticker.

“Tip: Photograph every new fish in white-light and blue-light before purchase. Markings hidden under amber store bulbs often reappear under your own aquarium LEDs, and that single photo file is your best later reference for ID questions.

Distinguishing Eclipse Catfish From the Often-Confused Sun Catfish

Most fish sold as Eclipse Catfish in the US hobby turn out to be Asian Sun Catfish (Horabagrus brachysoma) or a melanistic variant of that species, and the two names appear almost interchangeably on importers’ stock lists. The care overlaps but is not identical, so sorting the real ID early saves you from overstocking a tank or pairing the wrong tank mates.

Body Shape, Fin Profile, and the Dark Shoulder Patch

Horabagrus brachysoma has a stocky, compressed body with a broad head, a short dorsal spine, and a notably long adipose fin running along the back. The dark shoulder patch behind the gill cover is the field mark that gives the species its “black collar” nickname. True Eclipse labels tend to be applied when that patch spreads further down the flanks, producing an overall inky look, but the underlying body geometry stays the same.

Coloration Shifts From Juvenile to Adult

Juveniles often show a coppery or golden body with the dark patch standing out crisply against lighter flanks. Adults darken with age, and a fish that arrived bright can look almost black within 18 months. Stress darkens them further; relaxed, well-fed adults in dim setups often show a subtle bronze sheen along the lateral line that pure-black specimens never display.

Behavioral Tells and Realistic Adult Size

Sun Catfish and its dark variant both cruise the lower third of the tank by day and become noticeably more active at dusk. They hover in midwater more than typical bottom-dwellers, which surprises keepers expecting a classic substrate hugger. Juveniles ship at 2 to 3 inches, but adults routinely reach 10 to 12 inches, and well-fed specimens in spacious tanks occasionally push past that range.

That growth curve alone reshapes the housing question, because a tank that looks generous at stocking quickly feels cramped by year two.

Feature	Asian Sun Catfish (H. brachysoma)	“Eclipse” Trade Variant
Base color	Golden-copper to olive, dark patch	Overall dark brown to near-black
Adult size	10–12 inches typical	10–12 inches typical
Adipose fin	Long, low, runs to caudal peduncle	Same shape, harder to see on dark body
Activity period	Crepuscular, hovers midwater	Crepuscular, often more reclusive
Social tendency	Loose groups when young, more solitary with age	More solitary in trade reports

Setting Up a Tank Sized for an Active, Growing Bagrid

Buy the footprint for the adult, not the 2-inch juvenile sitting in the store tank. A 12-inch bagrid needs real swimming length, and most community tanks built around mid-sized tetras and cichlids run too narrow and too short for an adult to turn comfortably.

Minimum Footprint and Volume

Aim for at least a 75-gallon tank, with 90 to 125 gallons being a more forgiving long-term home. Floor footprint matters more than height; a 48-inch by 18-inch base gives an adult enough room to cruise without pacing the glass. A standard 55-gallon is technically possible but runs hot on bioload and tight on swimming room once the fish passes 8 inches.

Substrate, Driftwood, and Shelter Choices

Fine sand is the safest substrate for any bagrid because barbels drag along the bottom constantly, and rough gravel wears them down within months. Add a few pieces of driftwood, a couple of cave structures, and a stretch of dense plant cover along the back wall. Sight-line breaks, places where the fish can move out of direct view, do more to reduce stress than any amount of dim lighting.

Filtration, Flow, and Lighting

Bagrids are high-waste predators that produce a steady ammonia load, so overfiltrate rather than match the tank to the minimum. A canister rated for one and a half to two times your tank volume handles both mechanical waste and the gentle current this species prefers. Lighting should be moderate to dim, with floating plants or a partial canopy diffusing the input; bright top-lighting often pushes them into hiding for the entire photoperiod.

Lighting only works when the water beneath it stays within the ranges these fish actually tolerate, so the routine starts with chemistry.

“Tip: Skip the undergravel filter. Sand compacts over it, dead zones form underneath, and the barbel drag against the lifted substrate every time the fish feeds. A canister plus a small internal or hang-on-back polish is a cleaner long-term pairing.

Water Parameters, Diet, and the Daily Care Routine That Keeps Them Stable

The Western Ghats rivers these fish come from run slightly soft and slightly acidic, with seasonal swings a closed aquarium should mimic rather than ignore. Generic “tropical” presets of 7.8 pH and 200 ppm hardness will not kill them outright, but a long stretch in those numbers often shows up first as faded color, then as barbel erosion, then as an immune crash opportunistic infections exploit.

Targeted Temperature, pH, and Hardness

Run the tank at 72 to 79°F, with pH between 6.5 and 7.4, and general hardness in the 4 to 12 dGH range. Stability matters more than perfect numbers; chasing pH with chemicals every week causes more harm than running steady at 7.2. A liquid test kit covering pH, ammonia, nitrite, and nitrate is enough; you do not need a full laboratory setup to keep this species healthy.

A Protein-Forward Feeding Plan

These fish are omnivores with a strong predator lean, so the bulk of the diet should be protein. Rotate between a quality carnivore pellet, frozen bloodworms, frozen mysis, and occasional chopped earthworm or mussel. Treats like freeze-dried krill work, but soak them first to avoid constipation and bloat. Feed a measured meal once or twice a day, an amount they finish in about two minutes, and skip a day each week to keep the digestive tract clear.

Weekly Maintenance and Early Stress Signs

Change 25 to 30 percent of the water weekly, vacuum the sand gently around decorations without disturbing deep pockets, and wipe down the glass to keep light penetration high. Test nitrate after the change and aim to keep it under 20 ppm in a stocked tank. Watch for clamped fins held tight against the body, a washed-out or unusually pale body in a fish that should be dark, and barbels that look stubby or ragged; each one is a checklist item worth catching early.

• ▸Weekly water change: 25–30 percent with temperature-matched, dechlorinated water.
• ▸Substrate cleaning: Light gravel-vac pass over sand, never deep dig near décor bases.
• ▸Test priorities: Ammonia and nitrite weekly, nitrate after every water change.
• ▸Feeding rhythm: Once or twice daily, two-minute cleanup window, one fasting day weekly.
• ▸Stress watch: Clamped fins, pale flanks, ragged barbels, and skipped meals over consecutive days.

Temperament, Tank Mates, and How Aggression Shifts With Age

Juvenile behavior tells you very little about how an adult will run a tank. Most Eclipse and Sun Catfish in the trade arrive at 2 to 3 inches and behave like cautious community fish for the first six to nine months. Maturity, territory, and feeding drive flip that script, and a fish that ignored tank mates as a juvenile can start patrolling a personal perimeter once it passes 6 inches.

Juvenile Versus Adult Temperament

Young fish often shoal loosely, hover in midwater, and ignore everything that does not fit in their mouth. The first aggression shift typically shows up around 5 to 7 inches, when the fish starts claiming a cave or a stretch of driftwood as a territory. From there, the aggression curve climbs steadily, and a fully grown 12-inch adult will defend a much larger zone against any fish that strays in after lights-out.

Tank Mates That Work, and Ones That Do Not

Large, robust, mid-to-top swimmers make the best companions because they share water column space without competing for the bottom. Good picks include silver dollars, medium and large rainbowfish, larger gouramis, and robust cyprinids like adult tinfoil barbs or large Denison’s barbs. Small tetras, slow fancy guppies, shrimp, and small cichlids usually end up as expensive snacks once the catfish reaches adult size.

Tank Mate Category	Examples	Outcome With Adult Eclipse Catfish
Large midwater swimmers	Silver dollars, tinfoil barbs	Usually safe, occupy different water column
Robust bottom fish	Large plecos, adult clown loaches	Often fine, similar size avoids predation
Small tetras and rasboras	Neon tetras, harlequin rasboras	Likely eaten once catfish passes 6 inches
Slow or long-finned fish	Angelfish, fancy guppies, bettas	Stressed, nipped, or consumed

Feeding-Time Strategies That Reduce Ambush

Most aggression traces back to food. Scatter the protein portion across two or three spots along the tank’s length so the catfish is not the only fish in the room when a meaty item drops. Feed larger, slower companions first so the catfish is not tracking the smell of a target in distress. A dim feeding routine, with room lights low and only a small blue LED on, reduces the visual trigger that flips an otherwise calm adult into a hunting posture.

Quelling that hunting posture matters most when you’re choosing neighbors, since a stable adult still reads movement as opportunity.

“Warning: Never house an adult Eclipse or Sun Catfish with fish small enough to fit in its mouth. The species is not malicious, but its strike response is automatic, and the smaller fish simply stops existing one morning.

Breeding Notes, Lifespan, and Long-Term Health Decisions

Captive breeding reports for Horabagrus brachysoma exist but remain uncommon in the hobbyist literature, and true Eclipse variants have produced even fewer documented spawns. Most of the data points come from public aquarium notes and the species profile maintained on PlanetCatfish, with additional context from SeriouslyFish and FishBase. Treat any breeding plan as a long-shot project, not a reliable revenue stream, and build the tank around display rather than production.

Reported Spawning Triggers and Behavior

The few published accounts describe large adults in soft, slightly acidic water responding to a seasonal temperature drop of 3 to 4°F combined with a heavy protein conditioning feed over several weeks. Spawning appears to be an egg-scattering event rather than a guarded cichlid-style brood, with no documented parental care. Fry that have appeared are tiny, sensitive to light, and require infusoria-scale food for the first week before moving to newly hatched brine shrimp.

Common Health Flags Worth Catching Early

Barbel erosion tops the list and almost always traces back to rough substrate or stale water. Fungal blooms on the fins and body show up after a stress event, often a move, an aggressive tank mate, or a missed water change. Ich presents in the usual white-salt form, but bagrids scratch against décor less visibly than corydoras do, so a flashlight check after lights-out often reveals cases a daytime glance misses. Quarantine any new addition for at least two weeks before adding it to the main tank, and keep a small hospital tank running for fast response.

Lifespan and the Long-Term Plan

A well-kept specimen routinely lives 8 to 12 years in captivity, and exceptional keepers report fish pushing past 15. A 12-inch catfish that may live longer than a decade deserves a permanent tank plan from your first setup, not a “you’ll move it later” promise. Sort out your long-term space, your plan for the fish if you move or travel, and the cost of running a heated, filtered 90-gallon system for a decade before the purchase clears the bag.

The Big Picture

The label on the tank is a starting point, not an identity, and the real work is matching the species behind the name to a tank, a diet, and a community that fit a 12-inch, 10-to-15-year predator. Get the substrate soft, the footprint large, the protein regular, and the tank mates big enough to avoid the menu, and the fish will reward that homework with calm color, full barbels, and a long run in your room.

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