Hi, I've not had any problems feeding frozen blood worms or the live ones from my Daphina ponds. I think that it is possible to get packages that have thawed and then been refrozen or just too old. They would be a source of bacteria that could bloat up your fish. dave ------------------------------------------------------------------------- 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"!