Cole,
You never mentioned what fish are in the pond?
As catscratch asks, there are many organisms other than carp that also eat aquatic plants.
I am thinking(?) crayfish might do some serious damage to your coontail - but only if you DO NOT have predator fish in the pond. In a clay bottom pond, once the crayfish start thinning the plants, then the bass, etc. would quickly clear out your crayfish and ruin the plan.
I know there have been threads about crayfish clearing out the aquatic plants pretty effectively, especially after their initial stocking population increased substantially. However, I don't recall if coontail was one of the plants they mowed down?
Finally, if you do wipeout the coontail, then your algae problem will get worse, but then you would only be treating ONE problem.
