JP's got some good proven advice - posted enuff pics for all to see. Only thing I got to add is in most cases with tropical fish co-habs starting them young is the way to go. IMO mixing P's is better achieved as adults, my reasoning P's are parasitic feederes by desgn as juvi's. They live off of each others soft scale tissue and enioy a big meal when one gets sick - as adults they nip and chase but usual out grew the parasitic instinct - they grew into scanvengers and open water hunters depending on the species.