If you could grab a small package of hydrated lime toss some on the bubbles in the AM when they are there. DO NOT GET IT IN YOUR EYES AND IF YOU USE YOUR HANDS WASH WELL AFTER!

The protein with react with the hydrated lime and create a large molecule that will no longer float and sink for pond sealant and plant food.

Cheers Don.

[Linked Image from corvettejunkie.com]
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7/8th of an acre, Perch only pond, Ontario, Canada.