I had a similar issue, here is what I did that resolved it for me:
1) Stop Feeding, if its stomach is bloated...it would just make it worse.
2) Add some Epsom salt into the water, Epsom salt (Magnesium sulphate) at 1-2 tsp/10 gallons of water can be added.Keep the lights off.
3) It looks like Swim bladder disorder; hence search the forum you might find some suggestion that might work.
4) You may start feeding after 3-4 days, if you feeding pellet food; soak them in Epsom salt solution and feed it. please keep it to fewer pellets
Do let us know more about your FH diet that could help us narrow down the issue.
Note that it would take some time for it to recover, please be patient.
1) Stop Feeding, if its stomach is bloated...it would just make it worse.
2) Add some Epsom salt into the water, Epsom salt (Magnesium sulphate) at 1-2 tsp/10 gallons of water can be added.Keep the lights off.
3) It looks like Swim bladder disorder; hence search the forum you might find some suggestion that might work.
4) You may start feeding after 3-4 days, if you feeding pellet food; soak them in Epsom salt solution and feed it. please keep it to fewer pellets
Do let us know more about your FH diet that could help us narrow down the issue.
Note that it would take some time for it to recover, please be patient.

