I've really grown to love using sponge filters in my tanks. When I do water changes I squeeze them out in the bucket of waste water and them put them back in the tank. Don't lose any bacteria to chlorine from the tap water. This works best for me. Hydro sponges are also my sponge of choice because there is no dead space sitting on the bottom of the tank. Also easier to clean around when siphoning off things in the bare bottom tanks. John ------------------------------------------------------------------------- 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"!