White growth on betta

[pattyfurg]

I bought this cull from work with 0 finage on him and put him in one of my separators, had him for about a year, he's still acting the same and eating but as you can see in the following picture, on the right he has some white growth from the top of his gills



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[Matt68005]

National Fish Pharm : Nitrofuracin Green