I've found the tiny tiny ones are usually hydroids, aiptasia grow very fast while hydroids seem to just appear and don't get much bigger than tiny. Hope that helps. Try to get a pic if you can so we can id it better. Keep an eye on it, either way you may have a problem on your hands. Hydroids while not as much of a PITA as aiptasia, can still take over a tank and make it look rather unsightly.
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