Don't move him to your healthy tanks since you don't know what he has. You could infect your healthy tank.
First check water parameters and temp.
Does his eyes look cloudy or bigger?
Is he swimming irradicaly or just tilted sideways?
Are the tan spots fuzzy or just discoloration?
I would do a partial water change and add Epsom salts. Salt helps numerous disease from bloat, egg bound if it is a she instead of he, swim bladder disease, fungus, and ich.