Rayn
Greg contacted me in regards to your fish. Frequently when a fish floats or struggles at the surface it's a swim bladder issue. however, I do not know specifically if Erosa sp are devoid of or possess atrophied swim bladders. Many scorpionfish are devoid of swim bladders, yet there are mid water scorpionfish which possess rudimentary swim bladders, and conversely a number of sebastes sp. and sebasticus sp. (substrate crawling) have functional swim bladders.
What I would may help is multiple water changes, good healthy foods, and low stews tank mates will helpnalot, otherwise if it's a swim bladder issue, it's often an infection.