Common Pleco

Common plecos have a trick most algae eaters don't: a highly vascularized stomach lining that functions as an accessory air-breathing organ, letting them gulp air at the surface and survive in water too oxygen-poor for most fish to tolerate. That toughness is part of why released plecos have become a genuine invasive problem in warm climates like Florida — a good reminder that a fish outgrowing your tank isn't a release candidate.

Care level: Easy · Temperament: Peaceful · Max size: ~24" · Min tank: 125+ gal (adult) · Diet: Omnivore, algae wafers/veggies