I "rebuilt" my first tank and had a dramatic increase in growth. Here's what I did-
1) Changed to LumenBright refelctors
2) Added a calcium reactor
3) Took out the softies
4) Not sure about this but believe it was a smaller factor - moved the tank to the basement (more constant temp, cooler in the summer)
5) reduced fish load
6) Upgraded my skimmer
7) Went bare bottom