Cecil and Bob-I forgot to add that I have huge Cottonwood trees that hold a ton of leaves and i try to keep as many of them out as possible with snow fences and hand work as well. Would super aereating the water help the decaying process or should i just let mother nature take care of it? I have two aereators, one top water for a 3-5 acre lake and a diffuser on the bottom. The only reason i thought it was changing colors from the leaves is that my two little girls have a fish tub out in the yard and i noticed the water looked the same as the lake, it also looked light tea colored.