Your change is going to be hard since you have the best setup for the 300DD. I know that is what I had along with two 6' BML led strips. In the summer I would run the MH's only 3 hours a day and the BML led strips 8 to 10. Keeping my living area from heating up in the south texas summer. In the winter 8 hours of MH and no heaters.
A friend went to XR15 Pros versus the XR30's to get even lighting on his 5' x 30" x 27" tall tank. He installed six of them and it is a SPS tank.
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