Pest ID - I think it's just Detritus worms.

[jlauck]

Have these in my coral QT tank chilling on the glass.

 

[vetteguy53081]

Yes looks like detritus worms
Comes from lack of siphoning or too much left over food- reduce amount fed

 

[Baby Damsel 219]

have these in my tank so they don't harm the fish and provide a food source to my wrasse damsels they K!ll and may overrun the coco pod population.