The obvious is checking for high ammonia, which you probably already monitor. However, if you have not check ammonia in a while that could be the problem....although if the ammonia was high I would expect the fry to be adversely affected. Also the females fins would have begun to fray. ------------------------------------------------------------------------- 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"!