You say you want to build 6x3x3
I would not go deeper than 2'
Hard to get down 3' to clean/move things
Corals will not get enough light at 36 inches. But good for a FOWLR.
As far as acrylic vs glass, I vote for glass. I have a friend that has an older acrylic tank, and it is starting to "craze" ( is that even a word?) Tiny little cracks that are structurally sound (so I am told) but not very pleasing to the eye.
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