Warmer Water = More Marbling?

[Styx]

Okay, here’s the story, I have a betta I bred myself named Mu, he’s like a cellophane iridescent. I was looking through old photos (beginning of the year old) of him and was surprised to realize he used to have black marbling on him, which he no longer has. Well, since it’s been getting cold, I turned on the heater in his tank and after a week of being in warmer waters, he’s regaining all his marbling again.

Anyone else come across something like this? ^^ I just found it weird. It’s not like he was ever unhappy, and he’s never been sick, so his color loss could not be attributed to such things.

 

[soritan]

Yup, my marble VT has peacock coloring when he's in warm water or a humid room. It's quite striking, that's why marbles are my favorites. Never know what you're going to get.