rock tank: Ph 8.0, Nitrite 0.5 maybe a lttle lower, Nitrate 0. Bought new RO/dI filters today and filing the other 110 gallon tub, will move rock when water is ready. I have 5 days off starting tommorow expecting a lot of progress on the fish room and basement, will post picture soon. Hopefully Ill be filling the tank with RO on monday or tuesday... keeping fingers crossed.