Maybe swim bladder problem. Check water quality. Water change and salt. no food for a few days. I read that if you can get them to eat frozen peas that this would relieve the problem. Doesnt reallt look like a high shine aro. I hope they didnt charge you more for that. How big? 10" or so looking at the pic?
swimbladder problem indeed ... lower your water level , stop feeding , add salt/epsom salt , add some anti internal bacteria if necessary
x2, Disfunctional swim bladders cannot be fixed.Sorry, but head down tail up usually leads to dead aro. How long have you had the aro?