I know that plecos can get territorial at larger size but if they are small and grow up together they should be ok. The question I have is should i mix them when they are small so they know each other presence or should I wait til it grows to certain size?? Im just mixing pseudacanthicus family. Right now I keep each species in its own 10" breeder net to pump them up but I am just considering just to let them loose since I want to make it a community tank. They are about 2-3" and in a grow out tank 55 gallon with two good size Malaysian driftwood with river rocks.