Is that list you filled out from his home tank, or what you are doing in his QT tank?
The fin rot happens in poor water quality when they have a rip/tear in their fins- so letting us know the specifics for his home tank will allow us to help prevent it from happening again in the future. (How often and the % of water changes you do, temp, etc)
Not going to mention the treatment as it has already been covered. If he hasn't went down any after 3 days of no food, let us know and we can help you on the next treatment that should work.
If his poop is normal, you can go ahead and move him into his home tank. The tank itself won't cause fin rot- it's how you clean it and how often.
Freeze dried anything easily causes bloating if you aren't careful. They should be fed as a treat- once or twice a week, with only a couple at a time. Pre-soaking the couple of blood worms that you are about to feed in a bit of tank water for a minute or two will help out- as they expand inside of their stomachs.
Feeding only once a day isn't recommended, when you do you are for the most part either under feeding, or over feeding, neither is good. If they are the common pellets, 4-6 a day, spread between 2+ meals is ideal. If they say "mini" on the package, then 6-10 a day, spread between 2+ meals. Just make sure they say mini so you don't over feed. Also, one day a week fasting helps their system catch up.