I use to have 3 common Plecostmus together 2 were over 12" and smaller was 9". The 2 larger would go at it all day leaving the smaller one alone.
riggs said:i'd just like to add a question to the thread. for those that do keep more than one species in a tank, how big of a tank do you suggest to do so??

It should be alright. If you have 2 equal size pleco, it may counter some chase and 'pushing' but really a fight, but along as they're some hiding place, it should be fine.paintboi101 said:If i had, or do have more than 4-5 plecos, would they fight each other? and there all diffrent breeds of plecos.