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It does look like hail but I am 100% positive it is/was not. I was keeping an eye on the leaves as they grew underwater and there were very few holes. As soon as they reached the surface then the holes would start appearing. They are very weird though, one of the pots is too close to the surface and the pads are actually growing 2 - 3 inches above the waters surface and they have no holes.
I have been able to slow it down though. I read somewhere that mosquito dunks will kill other larvae as well so I have been putting them in and I think it is working. I have a lot fewer holes now and quite a few leaves (on the waters surface) with none at all.
Hopefully whatever it is will die out this winter and I won't have to deal with it next year!
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