We have some turtles that go between an outdoor pond for summer and indoor pond for winter, and recently noticed these barnacle-like things in the filter line of the indoor pond and on the rocks of the outdoor pond. Anyone have any idea what they are and if we should be concerned? They don’t really look like what I think of as barnacles, so that’s a bad way to say it, but they’re stationary and stuck in place like a barnacle. The pond is in southeastern Pennsylvania.
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