With the additional spread of the G6s you'll probably be fine without the ReefBrites. On my Red Sea 750XXL I have a pair of XR30 G5 Blues and a pair of XR15 G5 Blues running a modified 'radiance' template @75% intensity. SPS seem to be doing really well with this (they're in the 250-300 PAR range).Funny you ask that because I started with the XR30 GEN 5 Pro and 2 60" XHO reef brites and I was killing alot of SPS. My initial plan was to sell the 60" and get 72" but then the G6 came out so I sold my G5 Ecotechs, the reef brites, and bought 3 new G6 XR30 Blues (I wanted Pro but I brain farted when I clicked buy). As you can see above everything is growing good so I am not going to mess with it for now but eventually when everything is really grown out I will consider adding the Reef Brites again but for now with the amount of coral I have now and the space I don't think you need to start with so much spread.