My experience was that a pair of introduced A.cacatuoides had the worms initially but I didn't notice this for a few days; then after some weeks many of my other fish had them also. I don't think that they require another host in an aquarium perhaps in the wild this is what happens. Ken. > When I had "the problem" with the worms, I did some research and it seems > they need another host(s). ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!