My Bettas fins are turning clear

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.

 

Do you know your water parameters?

 

no, i ordered a test kit online but as of right now i dont

 

I'm sure it's fine if you are doing daily water changes.

no, i ordered a test kit online but as of right now i dont

Are there any sharp decorations in there that he might be ripping his fins on?

 

no just some silk plants and a fake skull. i’m just more worried about his fins being clear

 

no just some silk plants and a fake skull. i’m just more worried about his fins being clear

I had a fake skull in my tank (not with a betta) and the holes were pretty sharp.

Do you have a picture of when you first got him for comparison?

 

okay i’ll pull the skull out and do a nylon test maybe? and I only have this picture it’s very bad but you can see his red!

 

He also looks a little emaciated from that angle, any chance you could also get a picture from the top?

 

He also looks a little emaciated from that angle, any chance you could also get a picture from the top?

Sorry, here are some more pictures
Tank
What is the water volume of the tank? 3 gallons
How long has the tank been running? 6 months
Does it have a filter? Yes an air filter
Does it have a heater? Yes
What is the water temperature? 78
What is the entire stocking of this tank? (Please list all fish and inverts.) only him

Maintenance
How often do you change the water? Currently everyday but usually every 3 days
How much of the water do you change? Currently %100 but usually 50-30%
What do you use to treat your water? Prime water conditioner
Do you vacuum the substrate or just the water? Both

*Parameters - Very Important
Did you cycle your tank before adding fish? No
What do you use to test the water? Nothing right now
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.
Ammonia:
Nitrite:
Nitrate:
pH:

Feeding
How often do you feed your fish? Twice a day and one fasting day
How much do you feed your fish? 3 pellets each time or one bloodworm
What brand of food do you feed your fish? Omega betta pellets and freeze dried blood worms
Do you feed frozen or freeze-dried foods?freeze dried

Illness & Symptoms
How long have you had this fish? 6 months
How long ago did you first notice these symptoms? 2 weeks
In a few words, can you explain the symptoms? Fin rot, and loss of colour
Have you started any treatment for the illness? Aquarium salt and stressguard
Was your fish physically ill or injured upon purchase? No
How has its behavior and appearance changed, if at all? Behaviour has not changed, he has always liked to hide since i got him, but he still eats and flares when he sees his reflection when i put a mirror in his tank

Explain your emergency situation in detail. (Please give a clear explanation of what is going on, include details from the beginning of the illness leading up to now)
Pablo had fin rot that was pretty aggressive, I noticed it about two weeks ago and was treating it within little doses of aquarium salt and water changes. I then noticed he was losing his red colour, which I thought may be the marbling gene, but am worried that it has something to do with his fin rot. At the beginning of this week I began treating him with 1/2 teaspoon of aquarium salt per gallon as well as stressguard and his conditioner. I have been doing 100% water changes everyday and haven’t seen and progress in his colour or regrowth. He is still pretty active and is eating as normal, but I’m still scared he is sick.