ph of water is just around 6.0 when i give the water to them. have looked over alot of information on the net, def. seems like a calcium diff. -- open to suggestions from the group but for now my plan is to give them dolomite lime tomorrow.... i know its slow acting but i hope they rebound.. like i said, the problem is not completely over-whelming at all, so i am not freaking out but the problem will be addressed very shortly...thanks for the info