[Help! Fin rot??]

I haven’t seen him biting his tail. I am going to give another round of the medicine and take out my Java ferns (I think are rotting). I have been using seachem prime at every water change. Is there anything I can put into the water to help with ammonia levels? Thank you guys for your responses and help. 

[Help! Fin rot??]

Posted pictures. 
pH - 7.6

high range pH - 8.2

Ammonia - 0.25 ppm

Nitrite - 0 ppm

Nitrate - 5.0 ppm

[Help! Fin rot??]

I need some help trying to bring my fish back to life! I have a betta in a 5 gallon tank. He started showing signs of fin rot a few weeks ago. I started doing 25-50% water changes every 3-4 days. I purchased maracyn and ich-x and used for 5 days with no sign of improvement, but no worse, so I stopped using. Yesterday I saw he had a hole in his fins. I’ve been using aquarium salt at every water change, tested the water and nothing seemed too off. I removed some deco that could’ve been too rough. I just don’t know how to help this little guy. 😞