I am know to be an over-feeder of live baby brine shrimp. Thus Hydra very often. After trying lots of ideas I got the answer from Delores Schehr of Wet Thumb Aquatics. "Fluke-Tabs" by Aquarium Prod. Into 10 gal of water I crush 1/2 tab and within 6 hours ALL Hydra is gone. I have been using these "tabs" for a few years now with no ill effects and I have over a dozen diff Apistos in about 75 tanks. Z-Man ------------------------------------------------------------------------- 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"!