Jeff, Initially I would say no but when I used to maintain Tanganyikans I had one tank with undergravel plus coral sand. I had filter matting covering the U-G plates. Perhaps your best option would be the pea sized gravel with UG filtration. Helen >Is sand compatible with Undergravel filters? if so I might look into >it. otherwise i will use some form of fine gravel. >Jeff ------------------------------------------------------------------------- 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"!