I've got a similar problem. I pull the trolling motor up to water level, and
and motor around the pond (only 1A) and break it up as much as possible.
It looks like I have accomplished something when I finish, but a few hours
later it looks about the same as before. I have a creek coming into the pond
and a drain pipe that constantly pulls water out, so the problem isn't too
bad, just doesn't look that good. I think I'll just let nature do it's thing.

Just do it...