what is eating my coralline? ??

Over the past two days I have noticed little pieces of coralline missing from live rock. The white dots in the pic represents this. The only newer addition I have it two emerald crabs, about the size of a half dollar. Other than that only have standard clean up crew crabs and snails at the moment. Any clue? Thanks.

 

Your pics aren't coming through, but realistically, most anything will nibble on coralline for sustenance if it's not getting enough food.

 

I have two emeralds and they've been munching the coralline. There are what look like scratches all over. They just constantly munch. Every couple days I give them some dried seaweed. They love it.

 

Check for asterina stars.

 

White dots....are we sure they aren't nerite snail's laying eggs on it?

 

The pictures come through on a desktop but not on mobile for some reason. I just caught the emerald eating it. He was breaking off pieces. By dots I meant small exposed pieces of live rock. Thank you all

 

I couldn't get the pics either - doesn't matter - you found the culprit. Urchins are notorious for mowing down coralline but you don't have one of those....