Pistol shrimp covered in slime

[nczipp]

I got a yasha goby and pistol shrimp pair about a week ago. This morning I found the shrimp on the rock between polyps of one of our corals (not sure of the name of said coral, I will attach a pic). I shooed him out since I was concerned he might be getting eaten (he wasn't) and when I did he barely would moved to get away. He seems to have a bunch of "goop" on his legs, antennae, and claws. I would take a picture of him to show but I cannot currently find him.
Does anyone know if I should be concerned about this? He was acting VERY weird when I found him this morning (swimming sideways, scurrying his legs but not moving, etc).

 

[reefcoops]

I don't see the crab in the attached picture. Could the 'goop' be detritus buildup between the coral and rock?


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[nczipp]

I couldn't find him by the time I went to take a picture. That is what I suspect it was. Unfortunately, I just found him belly up on the sand


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