Head to head
Bristlenose Pleco vs Plecostomus
The bristlenose pleco and the common plecostomus are both popular algae-eating catfish, but the enormous size gap between them is exactly why so many aquarium keepers end up disappointed with one and satisfied with the other.
| Bristlenose Pleco | Plecostomus | |
|---|---|---|
| Scientific name | Ancistrus cirrhosus | Hypostomus and relatives |
| Typical adult size | 10 to 15 cm | 30 to 50 cm |
| Suitability for a home aquarium | Well-suited to most tanks | Outgrows most typical aquariums |
| Male facial feature | Fleshy branching tentacles | No comparable feature |
| Invasive populations | Not noted as invasive | Established as invasive outside its native range |
| Diet | Omnivore, algae grazer | Omnivore, algae grazer |
| Activity pattern | Nocturnal | Nocturnal |
| Conservation status | Not Evaluated | Not Evaluated |
Bristlenose Pleco vs Plecostomus: common questions
Which pleco is better suited for a typical home aquarium?
The bristlenose pleco, which stays a manageable 10 to 15 centimetres, compared to the common plecostomus, which can reach 30 to 50 centimetres and quickly outgrows most typical tanks.
Why do common plecos get abandoned or released so often?
Because they are usually bought as small, inexpensive juveniles without keepers realising how large they will eventually grow, and by the time a common pleco reaches 30 centimetres or more, many owners can no longer house it properly.
Do both plecos have the same facial features?
No, mature male bristlenose plecos grow distinctive fleshy, branching tentacles around the mouth, a feature the common plecostomus does not share.