I recently purchased a tiny CT female, who has a pale cream color body, with some light green marbling, and light blue eyes. The ends of her fins were greyish, almost black. I thought she might have fin rot, but she looked like she might be a beautiful pastel CT with a little care.
After some new water and a crushed pellet, she began to regain some color. I looked at her under my magnifer, and she had a pretty green sheen to her clear fins.
I floated her in a seperate container in my 5 gallon. She opened up her fins and her fin edges turned a plum color! It wasn't fin rot after all! :)
This morning, I looked at her and her eyes had turn black. I shined a flashlight into her eyes and saw they were in fact dark blue.
What I'm wondering is, why the dramatic change in eye color?
Is it a direct reflection of fishes health, like their skin colors?
I've noticed the changes to skin/scale colors due to water temp, mood, health, and agitation. Do bettas do this more than most fish, or do I just notice more because I watch them closely?
I did some research on the web about the eye color changes, but most of what I pulled up were changes due to illness... not what I was looking for...