Tiny black "beetles"?
A few of my orchids are infested with these tiny little "beetle-like" bugs. They are black and so tiny that they can be squished by the end of a toothpick. At first I thought they might be mites, but they hang around in the roots/media of all the orchids they are inhabiting. I've heard that mites are usually interested in the leaves, and I've seen none on the leaves of the plants. I've seen no damage so far. Some visible roots look fine. The bugs are a very circular shape.
Any ideas what they are? And insecticides that you'd recommend? Thanks!
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KristenReuel 
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