stunning, love... you giving it any different amount of light than the others?
side note, my shut, usual variety, has bright green root tips for some reason, just got it last fall so not sure what's going on. I read some where it does better with low to medium light, but if I'm missing the rubier root tips then I'll have to move it... on other hand, if in lower lights the root tips should be just muddy than really don't know for sure what's going on...