Questions - Need some input

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Hi! every one im planing to built a shallow rimless reef tank, and im choosing 2 sizes
1. 38X25X15 (L,W,H) 2. 35X35X15 (L,W,H)
I'm just wondering if 1 (150w DE MH) can support the L and W of my tank? im planing to have a LPS, Montipora Capricornis, zoas, clams and softies. Thanks!

Hi to all i have a 30g cube mixed reef 8 months old. i was planing to replace my old rock scape and sand to new rock scape and sand. the plan is i will remove my corals and LR and shipon my sand, then i repace it with new sand and put the new rock scape and place all my corals. do i need to cycle again my tank for replacing all my LR and sand to new one? TIA!