watermelons!!!!

I just bought a betta tonight. He's got a bad case of fin rot i beielve, but his tail fin and the pectoral fins are in nice shape. I have him in a planted 2.5gallon. What all should i treat him for? his gills also seemed a bit dark His colors are amazing

So I desided to enter Tiberius in July's contest. Please help me chose which picture I should enter :) Number 1: Or Number 2:

Hey! This is my first time entering the contest! :-D Now that I have a camera and a mirror, I'm putting it to good use! Looks like Corona is up against some major competition though! Good luck, everyone!