Need help with id some kind of pest?

[levi farias]

Lots of them out at night not on glass all over rocks . Tank inhabitants don’t seem to be damaged

 

[Eagle_Steve]

Either chitons or isopods. Can you take a pic with a flashlight shining on them?

 

[JGT]

Looks like chitons. And a lot of them. Good herbivores, not a pest.

 

[Eagle_Steve]

Also, without a pic you can count the plates (segments). If it has 8, it is chiton for sure. If so, they are harmless for the most part and typically eat micro algae and the biofilm on the rocks.

Edit: most part is in regards to a macro tank. They will eat macro as well.

 

[levi farias]

Oh man thanks a lot! Now just the aptasia to deal with