I had a severe infestation in my borellii tank and in my angelfish tank a little while ago. Thanks to the advice I got here, hydras are all gone now. As for hydra's predation issue, I must say I did not see that to be a problem in my borellii tank. All my borellii fry came through the outbreak and the subsequent medication of Fluke tabs unscathed. Mama fish was really good at keeping the fry away from the hydras and she was also pecking at quite a few hydra - her attempt to get rid of it? Fluke tabs did not affect borellii, mother fish or the fry. However, the freshly laid angelfish eggs were quickly and completely wiped out with the medication. Tomoko ------------------------------------------------------------------------- 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