So my betta is a little odd in the fact that he can change colors relatively quickly. I know that bettas turn pale when they're sick or stressed out, but this is a gradual process. My betta does it almost instantaneously. For example, whenever I change his water, he turns pale; almost completely clear in the majority of his fins as well. Once I put him in his new clean tank, he will go right back to his full color. He was also pale last night, but when I woke up this morning he had his color back and had blown a bubble nest. This doesn't seem to be a health issue, but if any of you have an explanation for this I'd appreciate it. In case you are wondering, I can give you the levels of whatever test you want for his water, but I'm almost certain everything is completely normal. Thank you!