NOT KNOWN FACTUAL STATEMENTS ABOUT KOI FISH GOLDFISH

I bought what I thought was a Koi betta - typically white with a little bit of purple and black. He has absolutely changed colours, and now he's primarily blue and black!koi need to be in big ponds 900-1000gallons minimum.. they get large and so are social fish, you very seriously should rehome that fish, ive got a 850gal pond and after seeing how