When a coral grows too big?

[smokinreefer]

That's a tough one. I love a tank with big grown-out colonies.

It's tough to hack up a grown-out colony like that and have it look like its former self.

Personally, I'd either cut it back to about 1/4 size and let it regrow, or trim it a bit and mount a bunch of sun corals below it. It would look great in your setup.