I use sand and pea sized gravel in all my tanks as I also keep a lot of eartheaters and never have had any problem. I would think that if your gravel had sharp edges this would possibly be the case but not from sand, I wouldn't think. Helen >I've heard of sand getting stucki n the jaws of Apistos, leaving them unable >to close their mouths. I would be hesitant to use it. >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"!