I use yeast CO2, so the diffuser is probably not an option. I dropped the flow of the filter almost nil, and put a pretty big watersprite floating right at the outflow of the filter. I also covered the back of the tank a bit more, so hopefully this will keep the fish in the tank. Thanks ===== J. Miller Edmonton, AB, Can. __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.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"!