The bugs are tiny, white or reds bugs will live inside the polyps keeping them retracted you'll see them scurry across the coral occasionally if you look close. Ive seen them on many mariculture/wild acros. Definitely would dip to just to be safe.
If it's getting darker thats a good sign, usually a coral that's been deprived of sufficient light will go dark or brown as it's coloring back up, just the zoox adjusting to a new environment. It may just need time to come around.