So I'm turning my tank to a mixed reef tank slowly. I currently have 75 gallon (48"x18x18) running 48" Current USA IC PRO Dual lights and recently bought Helios 108w 2 bulb T5HO light to get better PAR for sps. ( Attempting a mixed reef) I have 2 ATI bulbs, (Blue Plus and Coral Plus) i am changing out from stock bulbs which is going to increase my PAR. Currently my light fixture are resting on top of tank strapped down, as shown in picture. As I add these 2 new bulbs should I raise the light fixture? I have legs to raise the light, as shown in photo 2. Coverage isn't the issue as i have the 2 LED bars i can arrange for that its the light intensity that im worried about. Also I have a glass top i would like to add. Is that going to lower my intensity?