Those are amphipods from the looks of it, and a lot too. IME they are zoa munchers lol. They are harmless other then that. Do you feed lots to your tank?

I've got lots of these guys in my 125

My Copperband loves those! Wish there was a way to harvest then.

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What size is your tank? Go get a shrimp.... or two, whatever kind you like, & a Dragonet. Things will balance out.

They dont touch my zoas, yet. I keep them well fed! But I'm going to sell my 1 zoa rock so they dont get the opportunity but I'm to lazy to post and ad for it.
Its those stupid little white starfish things, Those ones are problems, I caught one on my red zoas today munching on a polyp.
I know I feed too much, but I'm lazy and I want to make sure all the evil pods, the clowns, the acans, and the snails all get enough food. It all works out. The pods havn't caused any damage yet other then making all my brittle stars dissapear...

I should make some kind of light diffuser tower with some type of macro algae in the middle, start harvesting pods for people.