Ken, Every once and a while we all get hydra in our fry tanks due to overfeeding of live BBS. I asked Delores Schehr of Wet Thumb Aquatics in New Baltimore, MI some years ago about it's cure. Her answer was "Fluke-Tabs" from Aquarium Products. I have used them ever since; probably 5 years now. I most often use 1/2 tablet for a 10 gallon tank but am sure that would be enough for your 15g. Just crush it very finely over the surface of the water with your fingers and in only a few hours the hydra will all be dead. I have NEVER had any problems with the fry or adults in the tank. I have a short article about this on my web pages. Don ------------------------------------------------------------------------- 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"!