Might as well put them back in the tank, they're harmless. Unfortunately they won't amount to much though, take a picture if you can and enjoy the moment is about all you can do. Many creatures have a juvenile stage in a hydroid phase. It could be crab larva, polyps ... some kind of invertebrate anyhow, no real way to know for sure.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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