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nats or fruit flies in my fish tank how do i fix this problem?

i have fruit flies or nats in my fish tanks light hood, and they don’t seem to go away i clean the tank its clean and after about 2 days there in the hood again and water is clean i dont know where they are coming from, there is no garbage by them or any food so i dont know. what can i do to fix this problem, do snails eat this little nats since they are on hood, should i get one or two? i dont know?

Nats in fish tank??

When the water level drops in my fish tank I can see a few very tiny nats on the tank above the water line. Does anyone know what they are, why they are there, how to get rid of them, are they dangerous to the health of my fish etc? I have mostly Tetras and they are pretty old (not new fish that I just brought home). Any serious info is appreciated.
Thank you , yes I do mean Gnats…didn’t know the proper spelling.