Thanks for your input. The aeration systems were not running 24/7.The diffuser system covers 6 Ac. of 6'-12' water and the two surface cover 3 Ac of 3'-6' water. Now running full time and water has cleared and fish are feeding well. 4-5 cloudy days preceded the die off and plankton bloom was on the heavy side. Will continue to run diffuser aerator 24/7