T5 lighting... How much is too much?

[Jtwax]

Currently I have a mixed reef 110 gallon, 48" wide, 30" tall and 18" deep. I am running 6 T5 HOs. All are Zoo Med brand bulbs, starting from the front of the tank to towards the rear... Actinic, coral sun, ultra sun, coral sun, ultra sun, actinic. Too much?

 

[gregoryleonard]

I would say no, I have a 6 bulb 48" 54watt ATI fixture with ATI bulbs over a shallow 8' x 2' x 12" shallow frag system and the fixture is 17" from the bottom. I get 200-300 PAR at the bottom and grow some nice SPS. Have you measured your PAR? How much PAR are you getting at the surface, middle, and bottom of the tank? What type of corals are you growing? I am not familiar with the PAR levels of the T5 bulbs you are using, so it's difficult to make any suggestions. Is this a new fixture that you added? do your corals not seem to like it? are you getting an algae bloom? Just trying to get to why you are asking the question.