I take a very different approach David. I use salt. Its safe effective and will not harm the fish. I use a tablespoon of salt per 10 gallons. I don't remember exactly how many days but at first they simply go into shock but recover unless we keep the salt bath up for about 7 days if I recall correctly. Many roads to Rome I suppose but I just do not feel it is necessary to expose fish to an organophosphate (active ingredient in fluke tabs) if I don't have to. I also think I heard a rumor that fleubenole 5% kills Hydra has anyone cofirmed this? 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. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader