A SECRET WEAPON FOR KOI FISH NEAR ME

I’ve never owned a koi betta just before and I was wanting to know if it’s usual for them to change colors rapidly? I’ve had my Galileo for nearly two weeks and in that time he’s gotten darker and is particularly now modifying to be lighter.Dec 30, 2016 #7 I'd a female for months, yellow koi, she didn't modify a lick. Red is a lot more more