the most important thing when your fish suffers bloat, swim bladder or constipation... is NOT TO FEED them.
so that the digestive system will not work twice as hard. just put a heater and set it to 32deg celcius to increase the fish's metabolism. if the stomach still bulges, you may need to put antibiotics (tetracycline) to the water... 500mg every 20gallons.
hope this helps!
hope this helps!