When a coral grows too big?

[Phormium]

Thanks to all above and the PM’s I received. It’s done and now I wonder what I was hesitating for. It looks so much better now. It was impossible to lift out, so I had to do the pruning while it was inside the tank—good time to have at least 3 hands!
I pruned at least half of the overall volume and chipped off the dead “stem”. It’s now lower by almost a foot and looks really good as I can finally see it from above.
Thanks again for the instructions and advice, the scale of it is so much better and now I can confidently prune in the future.
This forum can be real valuable as a resource!