Frogfish maybe swallowed air?

[sphelps]

More likely a swim bladder thing, I've heard of the swallowing air thing but it's pretty rare and happens when you net them/remove them from the water, given the circumstances I would pursue this any further.

Honestly this is why I stopped keeping these fish, seems no matter what they become ill in some way eventually and stop eating. A lot of it seems to be tied to diet and meeting the energy requirements they need just to feed is difficult.

I can't offer anything else, perhaps there is a general treatment you can try but the problem with these fish compared to others is they stop feeding while other fish may become sick they still usually feed.

Best of luck.