Plastic. Sorry, but the even the smallest species, bristlenoses, need at least 20 gallons. If you're looking for an algae eating suckermouth type though, try a trio of otos. They stay tiny and eat algae their entire lives, unlike many plecos and other so-called algae eaters.
None. Also something to remember is that they eat meat when they are full grown.
3 panda cory cats
