For a tank dimension of 29.5 x 22.5 x 19.5(h)'', how many bulbs would you guys recommend, 6 or 8? It will be a mixed reef consisting of LPS, zoas, clams, sps etc. Any help would be apprecieated, I'm having hard time choosing between an Infiniti 250W MH w/ 4 T5s fixture or the ATI 6 bulbs fixture.