Well I can only tell you what worked for me was adding about 400 soft shell crayfish. Well they are soft shell when they molt. These little buggers eat a pile of FA. Way way more than I would have thought.

Cleared out pond up in under a year. Now I didn't have a problem but we did scoop it out by hand with a net year round when ever we were down there. Last year after having the crayfish multiply we never had to pull any FA out of the pond. The only place we see it is right near the feeder and that is to be expected with waste feed.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.