I got my double tailed betta in November 2020, He had a white body and then red to blue fins. he started in a 1.5g tank with a heater and then I moved him to a three gallon tank with a heater and air filter. A couple weeks ago I noticed he had some progressive fin rot and began treating him with aquarium salt, it didn’t seem to get worse, but then I noticed that he had lost almost all of the red in his fins and he now has a white body and then blue to clear/translucent fins with some red spots. I have been treating his fin rot with aquarium salt and although I don’t think he has it anymore his fins have not seemed to grow back and I’m really worried about his colour. I recently started using seachem stressguard along with the aquarium salt. I use prime conditioner and have Indian almond leaves in the tank with him. I do a water change everyday and re dose the salt and conditioner with the new water. He gets fed twice everyday with a mix of both pellets and bloodworms. Any suggestions would be appreciated, I have attached a picture from today.