Does anyone have any experience with triploid carp, also known as grass carp for weed control in ponds? We have a 1/3 acre pond which seems to be regularly infested with the aquatic plant, coontail. We bought 2 grass carp 3 years ago, but it didn't seem to make much difference. We're considering getting more. I've also read that excess plant removal can increase algal blooms. Any thoughts?