NEW STEP BY STEP MAP FOR KOI FISH VS GOLDFISH

It's not at all advised to keep male Koi bettas with females or other fish that resemble bettas, like guppies, since this can set off aggression and territorial behaviors.but now it’s back to pale with a couple specks of black. His human body scales have also started turning out to be pale. Is this natural or a thing Erroneous with my tank?New th