My Dwarf Gourami has been sick since the 13th with what I believe is swim bladder disease. I isolated him in a quarantine tank and he seems to be doing a little better (at the start he was laying on the substrate sideways and could not swim upright). Now he can at least stay upright while resting, but whenever he tries to swim his spine curves like in the picture and can't seem to fix it. I've been trying to feed him since yesterday but it doesn't show interest. Any idea what might be going on? Also i was thinking of moving him back to the main tank considering he's doing slightly better since the heater I have in the quarantine tank is faulty and only heats to about 72 compared to the 78 in the main tank. Any advice on this?