That is your water clarity goal?. If you get the water to clear up to your satisfaction, and with 125 CC per acre (100in 0.75) as these CC grow to over 16" do not expect to have clear water. If you do as suggested and go to Overtons ask them what is the normal water clarity to expect with 125 large CC per ac. With that many CC in 0.75 ac IMO do not expect the water clarity to ever be greater than 12"-16" due to re-suspension of bottom silt .