Red worm with black head?

[Nick Steele]

Okay so this new Trachyphyllia I have for the past two days and it’s really healthy and fat. Feeders are out right after lights go off and it eats like a pig! Tonight I noticed a critter in its base. Looks like some type of worm (black head with red body). It has a burrow inside of the Trachyphyllia base and in the pic you can see the white sand around its hole.

Is it harmful? Should I super glue over it’s hole?

There are other holes in the base also should I superglue those too?

 

[Nick Steele]

Anyone?