Jeff writes: << Is sand compatible with Undergravel filters? if so I might look into it. otherwise i will use some form of fine gravel. >> If you find a way to keep it above the plate it will work. I've given some thought to trying a sheet of polyurethane foam from Joann Fabrics. Bob Dixon ------------------------------------------------------------------------- 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"!