I was possibly thinking it could be velvet too but it looks more white then the brown/gold color velvet should be.
the only parameter i have is its 78 degrees. This was a 20gal tank divided into three 6.6gal sections, however another one of my bettas died the other day so I took out all the dividers, did a water change and decided to medicate everything in the entire 20gal tank with the med trio. Forgot to get parameter before/after the water change and before dosing with meds.
This guy is from Nov 2020, no other symptoms. He was eating well and very active prior to being medicated. Hes still active but i have held off feeding for a week.
The betta that died was from Dec 2020, I didnt see any obvious signs of disease on the betta that died.
Other inhabitants include pygmy corys, chili rasboras and neocaridina shrimp, which all currently exhibit no signs of disease.