Is this a hydroid jellyfish? It is on the glass of my aquarium. Should I get rid of it?
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Yep. When I had them, I would just scrape them off with everything else while cleaning the glass. The kind to worry about are the colonial ones. These were around my glass for a few days, then I scraped and haven't seen again.
Not unusual to see them. Some bloom and disappear. Not always a hydroid I belive. Several species reproduce this way.
I've never removed them. I'm also pretty sure a lot of fish crabs and bugs eat them.

