pH check: the organic degradation does not only create nitrogenized compounds but also made up of phosphorus based products. Phosphorus exist, in great amounts, the the food that we give to our fishes. Phosphates are injurious already at low amounts (0,5 mg/l freshwater; 0,1 mg/l marine water) and go to act on the algae formation and the metabolisme, with effects denied to you on the aquarium environment. Freshwater and marine water.
(continue)