You may be on to something there reefyone, please start a thread & explain this ''enclosure feeding'':read: :dance:Pity, the beautiful piece. You may try to blow away or suck out the damaged tissue, using pipette or turkey baster.
If you can, place it in container (or a separate pico-tank, easily cleanable), where you can easily feed it, keep the food density high, easily clean and to do the water changes. As I said before, what worked for me - a smallest zooplankton.
I did such feeding chambers (with heater and the smallest power filter) for the sun coral, it helped,
then moved it to the tank, capable to process results of heavy feeding.
This is additional troubles, but not the first and not the last in reef-keeping. Consider it a hospital tank.