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Do you have any wrasses in your tank? I wonder if it might be one of those cocoons they build to sleep in.
Bro I have no clue but maybe a shot in the dark if I say snail eggs.
Lets throw the cards open on the table at the [HASHTAG]#reefsquad[/HASHTAG]
It looks like mucus from a coral with sand specks in it?
Do you have any wrasses in your tank? I wonder if it might be one of those cocoons they build to sleep in.
It could be a tunicate, but they don't usually have such visible spots.
What types of inverts do you have in the tank?
What kind of fish do you house in the tank?
Try slurping it up with a turkey baster and see if it returns. Maybe the white coral skeleton in the picture still has some hidden coral tissue.

