Productus suckermouth catfish
Chiloglanis productus
Productus suckermouth catfish exhibits a flattened body, broad head, and distinctive dark markings along its silvery body.
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About the Productus suckermouth catfish
This is a tiny African suckermouth catfish from fast, clear tributary streams feeding Lake Tanganyika - think boulders, gravel, and current. Its little suction-cup mouth is built for clinging to rocks in flow, and males have a more drawn-out caudal fin shape (which is literally what productus is referring to). If you like oddball hillstream-style setups, this one fits that vibe perfectly.
Also known as
Quick Facts
Size
4.9 cm SL
Temperament
Peaceful
Difficulty
Advanced
Min Tank Size
20 gallons
Lifespan
3-6 years
Origin
Africa (Zambia, Lake Tanganyika basin)
Diet
Omnivore-grazer - aufwuchs/biofilm, algae-based foods, small frozen/live foods
Water Parameters
22-26°C
7.5-8.5
8-18 dGH
Need a heater for this species?
This species needs 22-26°C in a 20 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Set them up like a hillstream tank: lots of smooth rocks, tight cracks to wedge into, and a powerhead blasting across the bottom. They get stressed and stop eating in a calm, bare tank.
- Keep the water cool-ish and loaded with oxygen - think 20-24 C (68-75 F), strong surface agitation, and steady flow. They do way better at pH around 6.5-7.5 and low nitrate (try to keep it under ~20 ppm).
- Feed after lights out or when the room is dim because they are shy at the dinner table. Rotate sinking micro-pellets, frozen bloodworms/blackworms, and small live foods; they are not algae-eaters despite the mouth.
- Give them multiple feeding spots because faster fish will steal everything in high flow. If their belly looks pinched for more than a week, they are losing the food race.
- Tankmates: stick with other current-loving, non-bully fish like small barbs/danios, hillstream loaches, or peaceful rheophilic catfish. Skip big cichlids, fin-nippers, and anything that dominates caves or the bottom.
- They are pretty tough with their own kind if they have enough rock piles, but in a cramped tank they will scrap over the best crevices. More hides than fish is the trick, and break up line-of-sight with stones.
- Watch for them getting sucked onto intake strainers in strong-flow setups - cover intakes with coarse sponge. Also keep an eye out for worn barbels and belly scrapes, which usually means sharp gravel or dirty substrate.
Compatibility
Good Tankmates
- Small, chill midwater schoolers like ember tetras, neon tetras, or harlequin rasboras - they stay out of the catfish's way and dont hassle the bottom
- Corydoras catfish (most species) - peaceful bottom crew, just make sure theres enough floor space and multiple hiding spots so nobody feels crowded at feeding time
- Otocinclus - same vibe: calm algae grazers that wont pick fights, and theyre not big enough to intimidate Chiloglanis
- Small, peaceful rainbowfish (like forktail rainbows) - active but not mean, and they mostly cruise the upper levels while Chiloglanis does its thing down low
- Gentle dwarf cichlids like apistogramma or ram cichlids - can work if theyre not in full breeding-mode and you give caves/wood so territories are clear
Avoid
- Anything big and boisterous like african cichlids, larger barbs, or most aggressive cichlids - theyll stress it out and can outcompete it for food on the bottom
- Fin nippers like tiger barbs or serpae tetras - even if the catfish is tough, constant harassment is a slow burn problem
- Predatory fish with a mouth big enough to try it (bichirs, larger catfish, big gouramis, etc.) - peaceful or not, if it fits its a snack attempt waiting to happen
Where they come from
Chiloglanis productus is one of those little African "suckermouth" catfish that lives in fast, rocky streams. Think clear water, lots of oxygen, and current that never really quits. In the wild they cling to stones and graze on the thin film of algae and bugs growing in it.
They do show up as imports now and then, but they are not a beginner-friendly catfish. If you like hillstream loaches for the flow-and-rock vibe, this is a similar lane, just with an African twist.
Setting up their tank
The tank is make-or-break with this fish. You are basically building a small river section: smooth rocks, strong flow, and very clean water. If you set them up like a regular community catfish, they usually fade over a few months.
- Tank size: I would start at 20 gallons long (or larger) for a small group. They use floor space, not height.
- Substrate: sand or very small rounded gravel. Skip sharp stuff - they scoot and brace themselves on the bottom a lot.
- Hardscape: piles of rounded river rocks, slate ledges, and a few tight crevices. Give them choices in the current and out of it.
- Flow: powerhead or strong canister return aimed along the length of the tank. You want steady movement, not a blender.
- Filtration: oversized and mature. They hate "new tank" swings.
- Oxygen: high. Surface agitation is your friend.
- Lighting/plants: low to medium is fine. Hardy plants can work, but rocks and biofilm matter more than plants here.
Warm, still water is a slow killer for these. If your tank feels like a calm pond, you are fighting their biology. Aim for cool-to-mid tropical temps and lots of circulation.
Water parameters do not have to be magical, but stability and cleanliness do. Neutral-ish pH is fine. What they really react to is buildup: mulm trapped under rocks, clogged sponges, and a nitrate creep that you can "get away with" on tougher fish.
Build your rock piles so you can siphon around and under them. The classic mistake is making a gorgeous boulder wall that turns into a detritus apartment complex.
What to feed them
They are not true algae eaters in the "they will clean your tank" sense. In my tanks they grazed constantly, but they kept weight best when I fed them like a micro-predator that also scrapes. If you only offer algae wafers, a lot of them stay skinny.
- Staples: sinking wafers/pellets that soften (spirulina-based is fine, but include something with real protein)
- Frozen: bloodworms, blackworms, daphnia, cyclops, brine shrimp (small portions, more often)
- Gel foods: great for sticking to rocks so they can rasp naturally
- Natural grazing: let some rocks sit in a bright tank or tub to grow biofilm, then rotate them in
Feed after lights out sometimes. Mine were bolder at dusk, and it kept faster midwater fish from stealing everything.
Watch their bellies. A healthy fish looks gently rounded, not pinched in behind the head. If you see that "hollow" look, step up the meaty foods and make sure tankmates are not outcompeting them.
How they behave and who they get along with
They are little, tough, and kind of secretive. Most of the day they wedge under a rock lip or sit in the flow like a suction cup with fins. They are not aggressive in the cichlid sense, but they do squabble for the best parking spots.
- Best kept: in a small group if the tank has enough rock territory (more hiding spots than fish is a good rule)
- Good tankmates: other current-loving, peaceful fish that will not harass the bottom (small barbs/danios from cooler water, some rheophilic tetras, calm hillstream-type fish)
- Avoid: big cichlids, boisterous loaches that bulldoze, large Synodontis, and anything that treats a small catfish like a snack
- Also avoid: slow long-finned fish that hate flow (they will be stressed, and you will end up compromising the current)
If you only keep one, it will often hide nonstop. In a group they still hide, but you will see more natural grazing and "hopping" between rocks.
Breeding tips
Breeding Chiloglanis in home tanks is possible, but it is not a casual "oops babies" fish. Most people who succeed are basically running a river-tank and doing seasonal cues: heavy feeding, big cool water changes, and lots of flow.
- Conditioning: feed heavy on frozen/live for a few weeks, keep water very clean
- Trigger: larger water changes with slightly cooler water can mimic rain pulses
- Spawning sites: tight crevices and undersides of flat stones; give lots of options
- Egg/fry safety: assume adults will eat eggs or fry unless proven otherwise; a separate breeding setup or removable spawning stones can help
If you are buying them hoping to breed quickly, do not. Focus on keeping adults healthy for a long stretch first. Once you can keep them fat and active for 6-12 months, then start playing with triggers.
Common problems to watch for
Most issues trace back to the tank being too calm, too warm, or too dirty under the rocks. They can look "fine" until they suddenly are not, so you have to read the small signs.
- Skinny fish that never fills out: usually not getting enough food, or being outcompeted, or the tank is too warm/low-oxygen
- Hiding 24/7: not enough cover, too much light with no shade, or aggressive tankmates
- Rapid breathing or hanging in the highest flow: low oxygen, clogged filter, or rising temp
- Frayed barbels or belly scrapes: sharp substrate/rocks or dirty bottom that is irritating them
- Sudden losses after adding new fish: they do not love swings; quarantine new arrivals and keep water changes steady
Do not treat them like a "cleanup crew" fish and then forget to feed. They graze, but they still need real meals, and they lose weight faster than you would expect for such a tough-looking little catfish.
If you keep the water moving, keep the bottom clean, and feed like you mean it, they are seriously rewarding. Watching a group of them pinwheel in the current and pick at a rock face never gets old.
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