HELP!! I have had 1 koi die. Do not no why. Now I have a good size goldfish dead! My white koi has what appears to be 2 dark spots on its side, and the top of its body appears to be getting red. My Ammonia is below .25 PH is high 8.0 nitrite 0.25 nitrates at around 40. I have naturally high nitrates in well water. I have been cycling just tank for a month. Just started cycling water through my grow bed.