I just got my tank I talked to my lfs and she says my tank setup is great but I have 1 problem my lighting is very bad. I have 2 light hood each holding 1 18 inch bulb (15 watt bulb) she says I need a 48 inch hood with 2 bulb 80 to 110 watts each???? I have a 75 gal tank I want live rock, sand...