new tank

it depends on the type of pleco...there isnt really a lot of them that would be able to stay in a 10 for life.

whats the dimensions of the tank? there are 400+ plecos all with slightly different diets.

All the plecos that will stay in a 10 or even a 20 for life are very small. Clown or candystripes L104, Zebras L046, Queen arabesque L260, but those are pushing it. The queen especially. THe L046 will cost an arm and a leg, and maybe and ear. The clowns stay quite small, but won't do much for cleaning. Most plecos will get too big.

there arelots of 4"ish plecos