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Pretty cool. It could be some type of jellyfish, or it could be a hydroid. The hydroid life cycle has a polyp form where they look something like anemones, and a medusa form where they look like jellyfish.
We had one in our bio cube. Don't know what it came in on; but during water changes it would go to the surface and swim around the copepods. Never seemed to harm anything and eventually disappeared.
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