Wich salt for treating betta fin rot?

[Fuliggine]

Hello,
I have a betta in a comunity planted tank with 5 harlequin rasbora, 3 amano shrimps and a nerite snail.
He has fin rot that I was hoping to treat with more frequent water changes but I decided to treat him with salt bath in a small container since I dont have a quarantine tank...so do I use aquarium salt or normal salt without iodine that I can find at the supermarket?

Any help is appreciated thanks!

 

[Brookster123]

Don't move him or add anything to the water. Just change the water and continue to weekly. What size tank?

 

[Fuliggine]

Don't move him or add anything to the water. Just change the water and continue to weekly. What size tank?

55lt/14.5 gall do you mean once a week?
I did and its not getting better..

 

[Brookster123]

How much water are you changing? Have you tested?

 

[Fuliggine]

How much water are you changing? Have you tested?

More or less 45% once a week(then a smaller water change mid week like..25% )
Water parameters are:
Ammonia 0
Nitrites 0
Nitrates 25

 

[Fuliggine]

Other advices since water changing isnt helping?