I have 2 maxspect razor 15000k 70w each on my 90(same footprint but a little deeper as your 75), I keep lps, no sps; with those you will be able to keep anything you want. I like them.
My bad I was just making a point that I only had 140w and that the 300w would be able to handle anything you want, I that I do like the maxspect lights.
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