What is growing on my live rock?

allie.23

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I’ve had this tank cycling for about a week now and I just found these guys on my live rock, I think it’s some kind of coral? I’m not extremely sure. It also could be dead as well but I haven’t noticed a whole lot of growth.

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Sharkbait19

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When open do they look something like this:
1636498737259.jpeg

If so, feather duster worm. Beneficial filter feeder common in reef tanks. They spread a lot in new tanks then die off after a bit.

Other guess is vermetids, but you said they released a fan and were soft. Vermetids release a large mucus net and are hard as a rock.
 
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allie.23

allie.23

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When open do they look something like this:
1636498737259.jpeg

If so, feather duster worm. Beneficial filter feeder common in reef tanks. They spread a lot in new tanks then die off after a bit.

Other guess is vermetids, but you said they released a fan and were soft. Vermetids release a large mucus net and are hard as a rock.
I think there’s dead ones on my rock it looks like hollow little squiggles and it’s just about as hard as my rock is
 
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Isopod80

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Hydroids can spread and sting coral similar to aiptasia. The tube forming varieties can be a bit of a pain to get rid of. Your best bet is to dab some gel superglue on the ends of the tubes to smother them.
 
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allie.23

allie.23

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They look like colonial hydroids to me.
Oh nice thank you! I believe
Hydroids can spread and sting coral similar to aiptasia. The tube forming varieties can be a bit of a pain to get rid of. Your best bet is to dab some gel superglue on the ends of the tubes to smother them.
thank you very helpful
 

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