Geez, I used to have red digi and finally removed it all. Then recently I took a piece from Grant as a pity move just to help him clear stuff, to prove that my tank is not entirely unsuitable for sps and to get some red in the tank. The small piece now has like 10 white bumps where new branches are appearing, reminding me of its weedlike growth rate for sps.
On the other hand, if someone is looking for a starter stick or their first sps, M. digitata can be a good, easier, hardier candidate.