Betta fungal infection isn’t responding to treatment

[Irksome]

I initially did a salt treatment in a quarantine bucket, but didn’t feel good leaving him in a bucket that I couldn’t hide from inquisitive toddlers, so I moved him back into the tank and started an anti fungal treatment. I have been adding treatment every day and changing water every other day for a couple of weeks now with no improvement. He is in a planted 6 gallon with snails.
Is there anything else I can try? I have started giving live food to boost his nutrition. I know that this is considered a disease of poor water quality, is it also a side effect of keeping a soft water fish in hard water?

 

[Barry Tetra]

How hard is your water in number?

move your betta to qt tank with no substrate and do 90% water changes daily and add salt, it works for my finrot betta