okay.... welll im a pretty nooby reefer.. i started out iwht a fish only tank so reefs are kinnda new to me my tank, which has been set up since late july/early august is a 20 long wih 35 lbs of live rock and 15 lbs of live sand 2 175 watt hallides (i just put new 10k bulbs in i thinkthat also...