I bought a property with an existing pond (maybe a half acre or so). It is being overrun with Hydrilla. I put 6 grass carp in this spring and they have not been able to keep up so far. I really would rather not use chemicals because of the vast amount of live stock that have access to this water. Is there any affective way to drag a pond this size until the carp can catch up? Or anything else I can do?

THANKS!