Rubber lip pleco
Chaetostoma formosae
intermediate careOverview
The rubber lip pleco (Chaetostoma formosae) is an underrated, genuinely useful algae grazer that stays a manageable 10–13 cm. Unlike many plecos it hails from cool, fast-flowing streams, so it wants cooler, well-oxygenated water rather than a warm, still tank. Peaceful and hardworking, it grazes green algae and biofilm off glass, rocks and wood, making it one of the more effective small plecos for algae control in a temperate community.
Tank & water
A single rubber lip suits 95 litres (25 gallons) or more. The key is cooler, well-oxygenated water at 20–25 °C with a strong filter and good surface movement.
- Flow and oxygen: replicate its stream habitat with brisk flow and aeration.
- Grazing surfaces: rocks, driftwood and broad-leaved plants give it places to feed and hide.
- Clean water: it dislikes poor quality, so keep up maintenance.
Feeding
The rubber lip pleco is a herbivore. It grazes tank algae and biofilm, supplemented with sinking algae wafers and blanched vegetables — courgette, cucumber, spinach and de-shelled peas. Once the visible algae is grazed down it depends on you for greens, so feed regularly. See the fish food hub and our best fish food picks. A sunken belly is a sign it is not getting enough, which is common in a very clean tank; offer a fresh piece of vegetable every day or two and remove the old one before it fouls the water.
Tankmates
Peaceful and undemanding of company, the rubber lip suits cooler-leaning communities — tetras, danios, rasboras, corydoras and cherry shrimp. It is a poor fit for warm-water fish given its temperature preference. It coexists calmly with other peaceful algae-eaters such as the bristlenose pleco and the otocinclus.
Frequently asked questions
The rubber lip pleco is a sensible, effective algae grazer for cooler community tanks. Give it good flow, oxygen and vegetables, and it will work away quietly for the best part of a decade.
Rubber lip pleco — frequently asked questions
Is the rubber lip pleco a good algae eater?
Yes — it is one of the better small plecos for algae, grazing readily on green algae and biofilm across glass, wood and rocks. Supplement with vegetables and algae wafers so it doesn't run short once the visible algae is gone.
What water does a rubber lip pleco need?
Cooler, well-oxygenated water — around 20–25 °C. It comes from fast, cool streams and dislikes warm, still tanks, so give it good flow and surface movement. This makes it a poor match for warm-water fish like discus.
How big does a rubber lip pleco get?
About 10–13 cm — small enough for a mid-sized tank of 95 litres or more, and far more suitable than the common pleco, which reaches 30–45 cm. It's a sensible size for a home aquarium.
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