Bristlenose pleco care for beginners
The bristlenose pleco (Ancistrus) is the pleco most tanks should have. It stays small, usually around 4–5 inches, eats algae all its life, and breeds readily in a home aquarium. That makes it a much better choice than the common pleco, which can outgrow almost any home tank.
Tank and water
| Parameter | Target | Notes |
|---|---|---|
| Tank size | 20 gallons or more for one adult | They make a lot of waste for their size |
| Temperature | 72–80 °F | A heater is needed in most New England homes |
| pH | 6.5–7.5 | Very adaptable; stable matters more than exact |
| Hardness | Soft to moderately hard | Local tap water is usually fine once dechlorinated |
| Ammonia / nitrite | 0 | Add to a fully cycled tank only |
Bristlenose like good flow and plenty of oxygen. Give them caves, rocks and plants to hide in during the day, because they're most active at night.
Feeding
- Driftwood: they rasp at it, and it helps their digestion. Keep a piece in every bristlenose tank.
- Algae and sinking wafers: the staple diet. A clean tank doesn't grow enough algae to feed one on its own.
- Vegetables: blanched zucchini, cucumber or shelled peas, weighed down and removed after a day before they foul the water.
Males and females
Adult males grow the branched "bristles" on their snout that give the fish its name. Females have few or none, usually just a short row along the edge of the mouth. Young fish are hard to sex until they're a few months old.
Breeding
Bristlenose are among the easiest aquarium fish to breed. Give a pair a cave just big enough for the male to fit, such as a clay or ceramic pleco cave. The female lays a clutch of orange eggs inside, and the male guards and fans them until they hatch, usually in under a week. The fry hang on in the cave living off their yolk sacs for a few days, then come out and graze on the same foods as the adults.
Good tankmates
Peaceful community fish such as tetras, rasboras, corydoras and livebearers. Bristlenose leave plants alone, and adult shrimp usually do well with them too. Avoid large or aggressive cichlids, and don't keep two males in a small tank, because they'll fight over caves.
Local fish
We raise bristlenose in Groton, Massachusetts, in local water. See our bristlenose and pleco lines and reserve from our next batch.
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