Black crusty thing with antenna

Finnjävel

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Hi.

Few time ago I got Clavularia coral which has two strange black crusty things. Looks like they have some kind of antenna. Antenna is shortest in morning and grows for evening.

EDIT: Correct coral name changed.

Are this some kind of aliens that transmit data to neighbour galaxy at the end of the day. Or are Green gloves keeping connection to friends with 6G?
Any suggestions?

They aren't moving. only antenna changes length a little.
IMG_20210705_114808~2.jpg
 
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Mibu

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Worm colony? Are there somewhere more info about reef worms? How looks the unhappy colony?
You can read up on spaghetti worms, spinoid worms. I can't make out in the picture what you are talk about.
When I said colony, I was referring to the cloves. The stalks of the cloves look healthy.

In your picture I made 3 circles.
Yellow circle looks like a sponge to me.
red circle are feather dusters.
Blue circle looks like a type of algae.

cloves.jpg
 
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