Hey gooch How high do you need to raise the pH. If you only need to stabilize it only a cup full of dolomite will do the trick without causing your water to harden too much. If the tank is heavily planted the plants will go nuts in there too. The stuff given off ( trying not to be technical) will be used by the plants giving your tank a nice balance. A buddy of mine is really into planted tanks, i'm not, and his pH crashes with all his plants and soft soft water, so he uses a small nylon bag with a cup full of dolomite in the back of each tank to keep it from having a pH crash. Works great for him now and his pH has leveled off in what he calls a nice workable range. John ------------------------------------------------------------------------- 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"!