Goldfish tumor please help five year old Goldfish
My fish has had a round spot about an 1/8 inch in diameter for about two years. Initially it was white in color and slightly raised. The cebterm had a black tint to it. In the past two months, however, it has grown drastically and looks angry and cancerous to me. The tumor is behind his eye and now spreads almost to his gill. It is about an inch now and white with red veins.
I have been more focused in the past few months on maintaining water quality for him using tetra brand easy balance weekly and tetra brand aqua safe monthly as well as tetra brand safe start. I’m very worried as the sore is growing very rapidly and my once very active fish just mostly sits at the bottom of his tank. When he does swim around, he seems to move well with no buoyancy issues, but I’m afraid if this gets any larger, it will cover his eye and/or gill.
He lives alone in a 55 gallon tank. Please view attached photos, any help would be greatly appreciated.