Ok. If they came in brown but colored up but in a faded way I would say lack of nutrients. Acro power should help. Try feeding some DT's oyster eggs or Dr. g's SPS Max. More fish poop and food will help tool.
I think I'm confusing everyone lol nothing browned out in my tank, they've came into my tank browned and they regained color but very faded. I think I'll do a algae scrubber to start