Rubber Lip Pleco
Chaetostoma formosae
Loricariidae
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About
The rubber lip pleco is a small, stocky loricariid from the fast, cool piedmont streams of the upper rio Meta and rio Guaviare drainages in eastern Colombia, where it clings to smooth boulders in open current. It reaches only about 10 cm, making it one of the very few plecos that genuinely fits a home aquarium, but it pays for that with an unusual demand: cool, moderately hard, relentlessly oxygenated water. A warm, still, soft-water community tank kills it slowly. Trade names are a mess, with L187b, L444, 'bulldog' and 'rubbernose' all covering several similar Chaetostoma species.
Care
Give brisk flow, high oxygen and cooler water than a typical tropical tank, ideally 20-24 C. It grazes aufwuchs from smooth stones and wood, so a mature, algae-covered hardscape matters more than raw litres. Peaceful with other fish but squabbles with its own kind, so allow one per tank unless the floor area is generous.
Diet
Grazes algae, biofilm and the tiny invertebrates in it. Back that up with sinking algae wafers and blanched vegetables, and offer frozen bloodworm or Daphnia now and then.
Tankmate compatibility
Gets along with (34)
Possible with care (187)
Avoid (50)
Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.
Telling males from females
What works for this species, most reliable first.
- Bristles and cheek spinesStrong · from about a year
Male plecos grow odontodes — spiny growths on the cheeks and along the leading pectoral rays. Bristlenose males additionally grow branching tentacles across the snout and over the top of the head.
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Frequently asked questions
- What tank size does a Rubber Lip Pleco need?
- A Rubber Lip Pleco needs an aquarium of at least 110 litres (29.1 US gallons) with a footprint at least 100 cm (39.4 in) long — for this species, swimming length matters as much as raw volume.
- What water parameters does a Rubber Lip Pleco need?
- Rubber Lip Pleco does best at 18–26 °C (64.4–78.8 °F), pH 6.5–7.8 and a general hardness of 8–25 °dGH.
- Is the Rubber Lip Pleco suitable for beginners?
- Rubber Lip Pleco sits in the middle of the difficulty scale — manageable for a careful beginner who has done the reading, but it has specific needs worth researching first.