Anthias swimming in a downward position

[Outdrsyguy1]

I've got an anthias that's swimming more and more in the downward position. Ideas? All of them have been healthy as far as I can see. This ones a hair thicker than most but I just figured she was the healthier one. What should I try to do? Seems to be eating well. They are due for prazi in 24 hours and their second ttm in 48 hours.
The small white blemish just looks like a scale missing or a blemish from getting caught or something. It doesn't look weird in any way or protruding.

 

[Humblefish]

Could be a gas bubble developing in the swim bladder, as anthias are deep water fish. Notice a bulge near the stomach area?

 

[melypr1985]

he's a bit splotchy as well. Any redness showing up on him?