Crab Id Hermit filter feeder?

[Generator]

I just found this little bean when I finished cleaning my tank today. I bent down to turn on the pumps and there it was, right next to the glass. I never would have seen it otherwise. What sort of looks like a shell is a centimeter at best. I saw the tiny bit of movement from the filter feeders otherwise I wouldn't have noticed it at all. I had to get my phone and zoom in to really tell what I was looking at. Eyeballs and lots of legs. Any ideas?

 

[smitten with ocean life]

@ISpeakForTheSeas