This tank gets no direct sun. I have already done an additional water change out. The PH of the tank was sitting around 6.5. The water added to the tank has a PH of around 7.5 to 7.8. There are 5 Sevrums, 1 Jack Dempsy, 1 med placo, 1 tiger loach,2 clown, 4 blue loach, 1 yoyo loach, and 2 as yet...