OK right to the problem: I have a ten gallon tank with a Koi and a goldfish in it. My tank already went through the cycling process and waters levels were great, water was clear. I went away for two weeks, had someone feeding them and when I came back, water was a little cloudy and PH was acidic and nitrite, and nitrate was a little high, also ammonia was high. I did a 25% water change, put in some PH 6.5 powder and thought that would clear it up. I was sadly mistaken. My water has turned super cloudy (can barely see my fish) my PH is still acidic (6.2), ammonia not as high, nitrite round 1.0 and nitrate between 20 and 30. I cant figure out the cloudiness though. Water almost looks dirty. I just did another 25% water change, levels are the same and cloudiness still very bad. Can anyone shed some light or help me please?