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they are sea fleas I think. I'm honestly not sure about them, but I'm sure there's info out there on them. I know that they are known sea insects called sea fleas, sorry I can't help more
It is a copepod mate I have thousands in my tank and reproduce well that's why my mandarin fish is so fat lol. Most fish eat them and its the main diet of mandarin fish and Scooter blennies
The more you see of these little fellas the better !