the burnt tail could be a bacterial infection.
usually, any redness is the give away.
if it is just frayed fins, it is finrot, and that is easy to cure usually just by doing some water changes and adding the salt.
normally, meds are not needed for fin rot. just improve the water quality, add salt, and the fish's immune system will do the rest.
Can you get your ammonia, nitrites and nitrates tested?
this will help.
see if you can post a pic of the problem, that will help to.
When he swam under my lighting, I saw a few white spots on top of him. Let me ask you this, if I treat for ich and he doesn't actually have it, can I hurt him?


