Does anybody know any good medicins for fin rot?

well,

i usually say the best treatment is to prevent it from ever happening.
have good water quality and that will never happen.

Add some penicilen and it should go away.

I think a really good one is by jungle labs.... its called Fungus Clear (tank buddies)
It clears fungus & bacteria. But I try not to use these unless absolutely necc. Cuz I think it will also kill your GOOD bacteria colony in the tank. I think the best alternative would be to set up a small hospital tank and treat that...put the fish who are showing symptoms in the hospi tank. This method also would save on dosage sizes, especially if you have a very large tank.