>>Is there anything else I can do to help detoxify the tanks other than water changes?<< I really don't know for sure. But I'd change out the carbon again. Assuming that the carbon did absorb any toxic stuff, I'd yank the contaminated stuff out and put in new, clean carbon. Bill Vannerson http://ourworld.compuserve.com/homepages/william_vannerson ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!