rm
Passport
- Family
- Bristlenose Catfish
- Grows to
- 12.5 cm (4.9")
- Lives
- 10–15 years
- Temperament
- Peaceful
- Care
- Beginner
- Swims
- On the bottom
- Keep
- One is fine
- Water
- 21–26 °C (70–79 °F)
Argentina
Care requirements
i
On record for Bristlenose Pleco: adult size, lifespan, minimum tank, temperature, ph, hardness, minimum group, diet, care level, swim level, tank length.
A figure that is not on record is left out rather than guessed. One marked Suggested comes from keeping knowledge rather than a page.
- Minimum tank 114 L / 30.0 US gal
- pH 5.5–7.5
- Hardness 1–15 dGH
- Diet herbivore
- Tank length 60 cm minimum
Care notes written from general aquarium knowledge, not from the cited sources.
About
This is the pleco to buy instead of a common pleco. Same job, a fraction of the adult size — a common pleco outgrows nearly every home aquarium and ends up rehomed or dead, and the bristlenose is the reason nobody needs to make that mistake.
The males grow the branching facial tentacles the name refers to; females get a sparser fringe or none at all. They're nocturnal, so in a brightly lit tank you'll mostly see a fish stuck to the glass around dusk.
They're genuinely useful as algae eaters, which is rarer than the shops let on — most fish sold for that job aren't.
Tank setup
Give them floor space rather than height. This is a bottom-dwelling fish that patrols surfaces, so the footprint is what limits it, not the volume.
Driftwood isn't decoration here. Bristlenose rasp wood and seem to need the fibre, and a tank without any tends to give you a fish with a sunken belly no matter what else you offer. Put in at least one substantial piece.
They want caves and shade — somewhere to sit out the day. A length of pipe or a proper pleco cave gets occupied within hours, and a male will claim one permanently.
Use sand or smooth gravel. Sharp substrate damages their underside.
Feeding
Feed them mostly vegetable matter, and don't assume tank algae will cover it once the visible growth is gone. Sinking algae wafers are the staple, and blanched courgette, cucumber and deshelled peas all get taken readily.
Feed after lights out. They won't compete with mid-water fish during the day, and in a busy community they quietly starve while the keeper assumes they're grazing away.
Give them protein occasionally — a sinking pellet, or frozen bloodworm — but not as a staple.
Avoid: leaning on algae as the whole diet, and floating foods they can't reach.
Filtration and flow
Filter well, and be honest with yourself about why: they produce a great deal of waste for their size. A well-fed bristlenose is a substantial bioload, and you need to filter for that rather than for the fish's length.
They like a strong current and well-oxygenated water, and you'll often find one sitting directly in the outflow.
With plants
Safe with established plants. They rasp at surfaces rather than eating leaves, though you can get incidental damage to very soft-leaved species from the grazing.
They won't uproot anything, unlike the larger plecos, which redecorate.
Health
Malnutrition is the most common problem here and the one people recognise least. A hollow belly, or a fish that's simply stopped growing, is underfed rather than diseased. Wood and vegetable matter fix it.
They're sensitive to poor water quality despite all that armour, and prone to bacterial infection wherever the substrate is sharp or the tank is under-maintained.
Watch for a fish that stops attaching to surfaces. A bristlenose lying flat on the sand during the day isn't resting normally.
Breeding
Give them a cave and a pair and this will happen by accident. It's one of the easiest egg-laying fish in the hobby to spawn.
The male takes a cave, entices a female in, then guards and fans the eggs on his own. He won't leave and he won't eat for days. The fry come out already grazing and want vegetable matter almost straight away.
The practical problem is what you do with them all. A productive pair will fill a tank, and most shops already have more bristlenose than they want.
Tank mates
Avoid3
- Common Goldfish Common Goldfish is not safe with Bristlenose Pleco: bristlenose catfish and common goldfish are a bad pairing.
- Fancy Goldfish Bristlenose Pleco and Fancy Goldfish do not mix: bristlenose catfish and fancy goldfish are a bad pairing.
- Oscar Oscar is not safe with Bristlenose Pleco: bristlenose catfish and oscars and other large cichlids are a bad pairing.
Only with care21
- Chinese Algae Eater Chinese Algae Eater is aggressive and Bristlenose Pleco is peaceful.
- Convict Cichlid Convict Cichlid is aggressive and Bristlenose Pleco is peaceful.
- Jewel Cichlid Jewel Cichlid is aggressive and Bristlenose Pleco is peaceful.
- Assassin Snail Bristlenose Pleco is a risk to Assassin Snail: bristlenose catfish and snails are a pairing to watch.
- Bladder Snail Bristlenose Pleco is a risk to Bladder Snail: bristlenose catfish and snails are a pairing to watch.
No conflict is recorded with the other 80 species in the database, so nothing to flag. 4 species are not covered at all, so they could not be judged either way.