I have a yellow guppy that has fin rot and signs of ammonia burn. I've noticed this for the past 2 days. He seemed fine in mannerism up until earlier today. Now, he falls the gravel a lot, I can see him trying to swim up but he has a hard time doing so. It's kind of like a spiral fall.

I have 5 tetras and another guppy, none of those seem sick or have fin rot.

I've increased water changes, added more aquarium salt, increased the temperature, and vacuumed the gravel.

I'm considering different medications. Are there any suggestions you can provide?

Please help soon.