Fin rot getting worse!

So as you guys may already know, my betta have fin rot for about a month now, I do 95% daily water changes and it still getting worse, here is the picture of before and after the finrot.

@Colin_T Is it possible that he nip his own fin?

You will have to use anti-biotic like Kanaplex + Furan 2.
Salt can also be used but may not be effective for serious case like yours.

Have you checked the tank water and tap water for ammonia, nitrite, nitrate and pH?

Colin_T said:

Have you checked the tank water and tap water for ammonia, nitrite, nitrate and pH?

Click to expand...

Yea; Ammonia0 , Nitrite, 0 Nitrate 5-13, pH 7.5, GH 3 KH 3.
Have been using salt and fungus clear med everyday for almost 2 weeks now.

He’s not eating pellets but prefer mosquitoes larvae.

fungus treatments don't do anything to fin rot.
if clean water and salt hasn't worked then you will probably need a medication to treat bacterial infections or anti-biotics

He’s getting better, Thanks everyone @Lajos_Detari @Colin_T
He is now really active!
Actually I have been doing 100% lately on his Qt tank
I just make the temperature and oxygen level the same as before I do 100% (for anyone who reading this, dont do 100% I just tested “old school” fish keeper stuff)

You can do complete water changes if needed. Just make sure the new water is free of chlorine/ chloramine before it's added to the tank, and make sure it has a similar water chemistry (pH, GH & KH) and temperature to the main tank.

Also don't catch the sick fish out. Use a small plastic container to scoop it out with some water, then wipe the inside of the tank with a clean sponge, drain and refill the tank, then put the fish back in.