Iam running a 4x54 bulb fixture it has been okay for a mixed reef although the higher light sps grow real slow. I have shifted over to a few more sps so when i have the funds iam going to get a 6 bulb fixture. Not sure if i will get a tek im kinda leaning towards getting one with fan as the bulbs have better performance. I would say if you plan to keep some sps i would get the 6 bulb unit.
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