Here are my tank parameters: Both Tanks: NO3: 0 NO2: 0 NH3: 0 pH: 9.5!!! (Usually 8) GH: 11 KH: 7 Temp: 80 F in 29, 75 F in 6 Water changes once a week. CO2 in System Six, none in 29. Light: 110 W in 29, 27 W in 6