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Well, I don't do sw just yet, but I can tell you right now nobody can answer your question without more info.
Is it a 150 long or tall, and most importantly, what is the Kelvin raring of your current lights and how many watts do you have all together.
I'm not to sure that's the problem .. It pretty much a half octagon shape and about 5 feet long I could post pics. But the light are just strips that I have sitting on top on the tank no canopy.