>The fish were fine for more than a week and if the Polyfilter turned dark >brown, I replaced it with a fresh cube. How do you get the cubes of Polyfilter in and out when they need replacement without tipping all the water out? Or do you transfer the water and fish to a fresh bottle with a new cube of medium? ------------------------------------------------------------------------- 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"!