Red Dots, Swollen Legs, Fungus

[Izy-the_]

My juvie axolotl had fungus a month ago. I was able to get rid of it, but since it was missing a couple of toes I decided to keep it separated from my other axolotl for a little while after the fungus had gone away. I put it back in with my other one last night, and this morning I woke up and noticed it had red spots on two of its legs. A few hours later, I noticed that those two legs were swollen and there was fungus once again, so I separated him from my other one and gave him a salt bath. I fed him a little while later, and after it looked like his stomach was pinched in the middle.
I’m really concerned, and I haven’t had any problems with my other axolotl in the 7 months I’ve had them both.