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They are totally harmless springtails . They will die if they leave the humid air around the aquarium, eat scraps of fish food, algae etc. from the waters edge and any dirty surfaces under the aquarium hood, make an occasional snack for fish, being so small they can walk on water and they will use their "tails" to jump if you try to touch them .
Like I said, totally harmless, however if you don't like them, just give the hood and rim of the tank a good clean.