Swim bladder problems are hard to fix.  If your fish is swimming upside down, it has a swim bladder problem.

It results when a fish sucks in too much air off of the surface of the water.

Do not feed your fish flakes on top of the water– place them into the current of the filter system to push the flakes down.

Fast your fish for at least 2 days, just in case they are constipated.

Place the fish into a tank with only a couple inches of water– 1 inch higher than the top fin of the fish

This will reduce the amount of work on the swim bladder.

Add in freshwater aquarium salt to the tank.

Feed your fish mushed up peas and wait until the fish starts to swim straight again.

If the fish does this again, leave the fish in the quarantine tank for longer and slowly add water day by day.