Rescued a dying Betta Fish from my LFS?

Hello :3 Today I went to get sand for some tanks and I ended up picking up a half dead Betta fish. He just looks so bad, but I wanted to give him a chance. I added Prime so all my readings are 0ppm for ammonia, nitrite, and nitrate (will test withing 48hrs). I did not test the water because I wanted him out of... show more Hello :3

Today I went to get sand for some tanks and I ended up picking up a half dead Betta fish. He just looks so bad, but I wanted to give him a chance.
I added Prime so all my readings are 0ppm for ammonia, nitrite, and nitrate (will test withing 48hrs). I did not test the water because I wanted him out of the dirty cup water so I did a water change on the tank and added Prime.

I am not sure what to do.
He is in a 10g tank with an UGFilter, heater (lights are off) and that is it. The little guy has (I think) swim bladder issues. I gave him a pea, but he only took one bite and I am not even sure if he ate it. He can't swim down and just stays at the surface of the water lopsided. He is breathing which gives me hope.

His name in Lucky (how unoriginal, but if you saw him then you would agree he is lucky).
Thanks for all of your valuable help.
For now he is still alive. He is a male blue/red Crown tail. Although right now his colors look really faded as he is probably extremely stressed.

The lady who saw me take him said "our specialist will take care of him and he will get better so just pick another one" (I told her I wanted to rescue him) and she hid him from sight. I went over to the counter and picked him up again and just purchased him after the lady left. lol
Update: I was doing a fish less cycle for this tank, but I ended up doing a water change and adding the Betta fish in; I know I was rash, but I am sure my cycle is more than half way (I needed him out of the cup!). I started with an HOB filter in that 10g (don't have it anymore, it is on a different tank as a... show more I was doing a fish less cycle for this tank, but I ended up doing a water change and adding the Betta fish in; I know I was rash, but I am sure my cycle is more than half way (I needed him out of the cup!). I started with an HOB filter in that 10g (don't have it anymore, it is on a different tank as a replacement for the one that burned out). I then added gravel from an established tank to the UGF. I will keep a close eye on my water and do the necessary water changes. Not ideal, but my big filter crapped out and this was the only tank that was underway.

He has more coloration now. I raised the temp to 82F.
He does not look "bloated", but can't swim. I am dreading an internal parasite.
He looks like he has a lot of ammonia burns. I hope he makes it.
Thanks for your suggestion will try it out.
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