See my build thread for this tank here:What kind of rock did you use? For a young tank that looks solidly mature.
https://www.reef2reef.com/threads/a...-sps-reeftank-up-within-a-week.339591/page-13
And you are right, this piece where that coral is mounted is from my old tank.
I did not wanted to break off the Master Yoda Acro colony when the previous tank broke and I had to rescue the coral ;-)
So a very few small rock pieces I carried over since I needed the coral material.