Salt wont really do anything for swim bladder. Fast him for a day and feed him a deshelled pea. Swim bladder issues are likely due to constipation and the pea will clear it up. Is the tank heated?
If the cause of the swim bladder problem is constipation then epsom salt is a far quicker and better remedy. A 20 minute bath in a 1tsp per litre solution often clears the blockage immediately. If the fish gets stressed then remove it early.
Why thank you. I have never heard of that as a remedy. I learned something new.
Ideally you want something a bit bigger than that, like an ice cream tub (well washed and rinsed, of course).
bloodworms seems to be what constipated mine the one time it happened, and i corrected it with a pea. i had honestly never heard of epsom salts as a rememdy, but I going to keep it in mind