Corals are pretty resilient, each frag comes from a different par, flow, nutrient tank. In most cases, given time the corals will go back to normal. My shades of fall encrusted alot, and was destined to explode from the base up however the pink lemonade to the right beat it to the flow and cut it off from the flow, so it never got to sprout up looking for flow, i also learned it realllyyyyy loves to be shaded from white leds. in the beginning it got blasted with too much light as a frag and was straight brown, while all other corals were colorful. Once the tort shaded it, the green came out and it started sprouting. It only took time, had i moved it when it was brown it may have died off completely, so its best to not go chasing stars or else you just stress the coral out more, it may also be a good rule of thumb to ask what the frags were grown under just to get an understanding as their prior living situation, lol.