>>Have you noticed any of the symptoms discussed there? more of a sitting on the bottom with no responce than a gasping for air >>makes me want to ask what you're using as substrate. just gravel >>Or are there any rocks used as caves, terracing support, etc.? Have you tested >>them for carbonate content? some rocks, slate, and no i havent >> Are you using the same thing(s) in all of the other, non-problematic tanks? in the other tanks i have Lake MI beach sand and driftwood no CO2 Patrick Claytor ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!