Specifically, I have a 25 acre lake that is 30% to 40% covered in Coontail and it has 160 Grass Carp that have barely made a dent in the lake over the past 2 years. We just added an additional 100 Grass Carp, which gives us the maximum by law. There is virtually no other plant life other than coontail. I am in great hopes that we have a lake with 10% coontail.