Is this a colony of feather dusters?

Por914

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Hello, I have had this rock for about 13 years in a BioCube and bought it as a wild live rock. I have not seen these guys before until I moved the rock to a new 65 gal setup.
What are they and are these critters reef safe?

Thanks in advance!

7B3DEE0A-8062-49E9-91F3-A04A81CB8AA2.jpeg
 
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Ron Reefman

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Do they retract super fast if you touch them? Like almost before you actually touch them?

If not, I'd say I'm 98% sure they aren't feather dusters. They look more like a colony of zoas to me.
 

JGT

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Hello, I have had this rock for about 13 years in a BioCube and bought it as a wild live rock. I have not seen these guys before until I moved the rock to a new 65 gal setup.
What are they and are these critters reef safe?

Thanks in advance!

7B3DEE0A-8062-49E9-91F3-A04A81CB8AA2.jpeg
Look like Aiptasia to me. You’ll want to get rid of them as they will multiply and sting corals.
 

eschaton

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In my experience, these type of colonial hydroids die back pretty quickly as tanks get established. It's weird they are on old rock, but maybe the movement to a new setup disturbed things enough for them to get a foothold. I'd watch and wait - they don't tend to jump around the tank in my experience.
 
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Por914

Por914

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0C4945C6-481C-4FE6-897A-F3538E92F101.jpeg
Here are some pics with white lights on. They do retract when you touch them, and they do so with many heads at once near the one that I touched.
0BF0BA8F-B4C8-4DDB-B574-857C7A0066A3.jpeg
 

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