Hello everybody, I have two fish, Skye and Lighting, that I think might have fin rot,

Skye has a hole in his fin and a part of his fin that is starting to tear, but not black edging that I can indicate, on the other fish, Lightning has not developed fin rot yet, but has black edging on his fin. I don't remember how to treat fin rot, I could use the help, and
Skye I think also has swim bladder disorder,
he swims with his back side up in the air and when he gets
to the bottom pushes himself under a plant to keep himself at the bottom. I would like to know how I can help him with the issue that he has. But I have not experience with swim badder. Please help! Thank you all in advance!