What’s on my Emerald crab...?

[Inexperienced Reefer]

Hi everyone.
I have a little female emerald crab that seems to have fine filaments all over her back and legs... it almost looks like tiny anemones...
any thoughts? Sorry for the poor picture. The video is a little better....

Thanks in advance!

 

[Timfish]

Looks like a hydroid species. Not something you want to get established in your tank. You might try an H2O2 dip (6/1) or probably better keep it isolated in a bucket or small QT until it molts.