i now have all my plecos together in my community tank, its a 300l, i have 2 adult silver dollars, 4 columbian tetras, 4 phantom tetras, 2 small bala sharks and 7 assorted corys. my plecos are 2 lda33 snowballs approx 3 inches, 1 gold nugget also 3 inches, 1 l066 king tiger about 2 inches and 3 l34 leopard frogs about an inch and a half. my plecs get along with no problems at all due to the fact i have many caves and hiding places for them. i find this makes them more active as it makes them feel more secure. i find that if you dont have many hiding places in the aquarium then the pleco becomes reclusive.