How about use sand, wood with plants that grow on substrate (ie java fern and moss)- It seems to be working well in my nijsenni tank. Cory Williamson ------------------------------------------------------------------------- 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"!