Hello, everyone. I came back from my internship today and noticed some red developing on Sir Crispin's tail. I've kept fish before, but never bettas. It doesn't look like any of the problems I've seen in other fish. But, its sudden appearance has me concerned.
I did a 50% water change last night, and all of the water perimeters were in check. The tap where I live does have a high ammonia content, but I treat the living hell out of the water before it comes close to my fish. Here are some pictures, with the areas in question circled.
He's been very active: swimming in his usual spots, exploring the tank, flaring at my hand mirror when I put on makeup this morning, begging for food, etc. He's also been holding his fins up well.
My question is: is this new color developing or something that I should be worried about?