I have an elegance.
He has been in my tank now about 6 months and has definitely gotten bigger.
Honestly, I couldn't really tell ya what Im doing right/wrong. Its in my 50 which is almost 100% reef (barely any fish and barely any shrimp) so I tend to hit the tank up with phytoplankton, Reef Solutions, and some frozen foods from time to time.
Something of note. That tank only has PCs and doesnt have a hallide on it. Not sure, but maybe they are lower lighting? He is on the bottom.
Ian