Do you feed with bbs or other small living food? They tend to gather at the top where the light is after a few minutes in the tank, which is where the hydra are now starting to reproduce. I'm not sure how they ever get into our tanks, but I do know that they only show themselves in numbers when there is ample food. At that size and location in the tank, it is unlikely that the hydra will be a problem for your borelli fry, so maybe leave them for now if there are fry. One solution I have heard of and not yet tried to get rid of them (it's been a few months since I've seen them) is using a 9V battery. This low voltage kills the hydra, but I guess it's too low to harm the fish. Like I said, I haven't tried it, but I have read about it's success about a year ago. Was it on this list? I don't remember, I belong to too many - if there is such a thing ;-) ===== J. Miller Edmonton, AB, Can. __________________________________________________ Do You Yahoo!? Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free! http://photos.yahoo.com/ ------------------------------------------------------------------------- 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"!