Ted, As a matter of fact, I have Apistos (Nijsseni) and Columbian Rams with 5 discus. they are oblivious to each other. I have had others at other times. They occupy different levels as Mike said and even during feeding, they ignore each other. Rich ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!