BTA no longer inflating

I have a BTA that used to have an anemone crab hosting in him. However the Anemone crab has since left the BTA. since the Anemone crab de-hosted the BTA has shrunk and is now about the size of a quarter. All of his tentacles are out but nothing is inflated. Any ideas on how to help?

I will try to get a picture later.
 
Ca - 460
Hardness - 10.5 dKh
Phosphate < 0.25ppm
Nitrate - 5ppm
Nitrite - 0ppm
Ammonia - 0ppm
Temp 78.2
Spgr 1.0245/33

No other changes see picture attached
 

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It looks odd but doesn't stand out as unhealthy. It may just be going through a phase. Sometimes they do random things.

What is your water flow like were it is? Lighting?
 
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