What frag is that, name wise?
Look in the middle of your first Pic. You see where the Acro frag has started to grow onto the rock? Look at the pigment, that's a protein pigment "infection". That's just what it's known as, it isn't a problem.
What it does, is causes that swirling in the color that you see when it's encrusting on the rock. It's starting to do that on the bottom of the frag.
I don't think anything is wrong with your lighting or anything else. I think your frag is getting used to your lights and water and is starting to change color. I like the deep blue, but I have to tell you, if it keeps swirling like that, you'll have a VERY, VERY nice Acro on your hands that will be valuable.
Here's the swirling from your Pic.