I went over to the local Farm and Fleet and bought enough levamisole hydrochloride to treat 200 25-lb pigs (or 25 200-lb pigs!). I used a laboratory scale to weigh out the appropriate dose for my 29 gallon tank (estimated 25 gallons of water). All of the fish survived, and the pair that was badly infected are now free of any visible parasites or irritation. All fish are eating well, too. I haven't identified the fish yet. The might be A. borelli. I bought them a few weeks ago as "dwarf umbrella cichlids with nematodes." Thanks to all who responded. Susan Drozdz ------------------------------------------------------------------------- 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"!