A lot of folks use heavily planted tanks to keep nitrogen compounds at zero. Enough plants in a light fish load set-up will work even better than a filter. Bob Dixon ------------------------------------------------------------------------- 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"!