I know I remember posting something a long time ago about this, but I don't think there was a final answer. I have 2-250 Watt DE HQI 10,000K bulbs (hopefully the DE Aqualine bulbs) that will be going over my 48inch long 90 gallon tank. My idea is, that if I put a 3rd bulb (6500K) in the middle I would have a good varience in spectrum for my SPS and really high PAR which would allow for great growth and good color. The unit also has 2 T-5 supplemental Actinics. The 3rd bulb would be a 150W or 175W... Good/Bad Idea??? I really appreciate any opinion!