Yes. The best way to glue a gorg is to peel the flesh off the skeleton where it has to be glued (with a neat cutting) and then glue this part of the skeleton. If not tissue can rotten and infext the colony.
I experienced that most nps react better if they have a daytime, but don't require light to thrive. Menella are strong, if you find the problem ( may not totally well fed or some algae, being the tip the closest point to the light) and give it proper car it will recover and start growing after.
Regards