I just did a 20% water change, my tank has RO/DI, Ammonia is 0, nitrates 0, phosphates about .5, PH is 8.3. The sides and back of the tank have green algea. Problem is with the tank lighting (260w) it looks greenish yellow. The back of the tank really looks more yellow than the front. Comments, suggestions welcome....:rollface: :rollface: