What are these?

[omardamian25]

So I bought a box of Caribsea Liferock Frag Zone rocks, the directions said to rinse them lightly so I did but after a few hours I noticed these "bugs" swimming around. I'm new to this hobby so I have no idea what they are and whether they're beneficial or not. And if they're not, how do I get rid of them?

Thanks!

 

[vetteguy53081]

So I bought a box of Caribsea Liferock Frag Zone rocks, the directions said to rinse them lightly so I did but after a few hours I noticed these "bugs" swimming around. I'm new to this hobby so I have no idea what they are and whether they're beneficial or not. And if they're not, how do I get rid of them?

Thanks!

View attachment 2957488

Copepods which is free food for fish and coral

 

[Sisterlimonpot]

They are copepods. Extremely good for the tank, it's considered live food for your picky eaters.

 

[Tuan’s Reef]

I usually get an explosion of copepods on a new tank, than it slowly wanes into equilibrium. Get some phyto to feed them and sustain your popuplation