KOI FISH VS GOLDFISH THINGS TO KNOW BEFORE YOU BUY

I purchased what I believed was a Koi betta - generally white with a little bit of red and black. He has completely adjusted shades, and now he's generally blue and black!Just about in no way ever from the history of at any time includes a marble betta NOT improved as it ages. I really Never think it's feasible for them to remain precisely the same