WHAT DOES KOI FISH POND KIT MEAN?

I’ve in no way owned a koi betta right before and I had been wondering if it’s typical for them to vary hues quickly? I’ve had my Galileo for nearly two months As well as in that point he’s gotten darker and is particularly now transforming to become lighter.! Now to your best part... these "PEANUT" Koi's that came in these days had me blow