Hello Tsuh Yang Chen I do feed beefheart to my fish, not alot but enough to know that they love it. Guppies, killies, tetras, corys, angels, discus, apistos and some african rift lake cichlids as well. I have never had a problem with it. My fish eat it very quickly and readily. If they dont eat it all, you do have to remove the excess quickly as it will foul your water pretty quick. So all those fables about not using beefheart is a bunch of bull. I have a friend who uses it as a main staple of his fishes diet. His fish are absolutely gorgeous and huge. You cant imagine how big Blue Gularis get after being fed beef heart. John ------------------------------------------------------------------------- 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"!