Forget Pleco's Get Ottos
Forget Ottos get GLASS CATFISH
:D glass cats are awsome and friendly they are great in a community tank and will not pester fish although they are not algae eaters they do eat flake food and brine shrimp. You should keep your glass catfish in a shoal of 6 or more because in the wild they live in shoals of Thousands and if you get a single glass cat he will not eat-swim-act normally so GET A SHOAL.
Also these little guys are not hardy, Be carefull when doing water changes etc.
:WARNING: Not a beginner fish