Jerry - Same colour change happens to my Agassizii as they grow old, large and dominant. They also get a bit of a hump on the head. Unlikely to be the food as I mostly feed frozen bloodworm or live daphnia and mosquito larva. Unless it is the redness in the bloodworm that has an effect? Cheers ------------------------------------------------------------ from John McCrone ------------------------------------------------------------------------- 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. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto