Here I go, by rinsing the sponge under the tap are you not destroying the valuable bacteria. You should be rinsing the sponge in the 'tank' water. Helen From: Bill Phillips <WilliamPhillips2@access.net.au> > Why use sponge filters ? - they are cheap, very easy to maintain (rinse > under a tap each week) and can easily transferone to a new tank and hey > presto you have a fully operational mature filtration system. > Bill ------------------------------------------------------------------------- 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"!