Hello, I'm don't know the answer to the question on whether the opal borelli is a fixed form. They have tended to stay smaller than my yellow head borellis. Also, the male doesn't seem to show as much color. However he does have beautiful fins. Joe Hildreth 15 Cedar Street Potsdam,NY 13676 ------------------------------------------------------------------------- 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"!