Please help ASAP! tons of microscopic bugs

[Stoner]

Noticed these black/brown bugs today on my gravel and glass ! They don’t seem to be harming my discus and plecostomus. They appeared out of no where , i haven’t brought any new plants or new fish into the environment and I do my daily water changes regularly. I’ve done tons of research and I can’t seem to find any information on what they are and how to get rid of them. Please help!!!

 

[Fresh2o]

Those appear to be a type of aquatic mites. I have had them before in one of my tank. They did not bother the plants or fish.

 

[SaraB]

Your fish may end up eating them anyway. Bugs are extra protein.