My second pond suffered from clay suspension after every rain. When I installed aeration, it went to being cloudy all the time.

One FEL full of limestone screenings (which includes sizes from fines to about #57; we keep it in stock to mix with manure when spreading) caused the clay to settle out permanently. I add another FEL load every two-three years.

Adding limestone also increases ph buffering; I don't think it can hurt anything. A lime search here (or words from one of our water quality experts [Cough! Cough! Bill Cody] will let you know what forms of lime are safe to use in ponds.