Lighting plays a huge role. But "upgrading" may not be the best term. Maybe "altering" or something like that. I mean two 175 watt halides on a 10 gal tank is a lot of light. But then again two 175 watt halides on a 100 gal tank is not nearly enough.
What else do you have in addition to those halides? If nothing, then I would suggest some VHO actinics of some sort.
Adam