bugs

Can someone please help me by informing me where these little tiny black bugs come from and how to get rid of them. I saw them on one tank and I would just vacuum them up but more pops up later now I see them at the back of my 120 gallon....PLEASE HELP????

Has anyone ever done this with there fish a lot? I just noticed my apistos loved my fruitflies and bean beetles. Curious on other peoples experience

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