Yes whatever amount you have control 2/3 or 1/2 of it. 1/3 the fish (amur and/or tilapia) eat and 1/3 you remove and/or chemically control. 1/3 + 1/3 = 2/3 for those 'fractionally' challenged.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine - America's Journal of Pond Management
