Acro crab

[NikeLV]

Hi,
I bought an Acropora Crab a few days ago and placed it on one of my Acro colonies. Since then, it's been motionless, so I assumed it's preparing for a molt. But, today I discovered a huge white bubble completely engulfing the crab. (If you've used reef glue, it almost looks like a huge dab of glue in the water) Is that part of the process? Should I take it out?
Thanks

 

[Betta132]

That sounds like some sort of fungus consuming a dead thing.