Im thinking of starting corals and such...easy to moderate ones though. i have 440 watts of VHO lighting in a 2 year old tank. Have about 150 lbs of LR and 90 lbs of Sand as substrate. Im thinking of doing xenia...have heard these are easy. Any special advice other than the obvious - good water levels? I monitor the essentials (trites, trates, etc) and sometime AK and CA. Anything else? I just want to prepare myself before I jump into this. I think I will then venture out into polyps as well.