So one of my 3" Keyholes gets this bright red coloration at the base of it's pelvic fins from time to time. It seems to happen when I feed, but not every time. When I check back awhile later, it is gone. Is this something normal or should I be concerned? I've kind of thought maybe it just happens when it gets excited or something but I honestly don't know. I'm just curious what you guys have to say about it since you're more cichlid savvy than I am. Since these two are my first, I am learning more about them as they grow and mature.