What size sump? If it is for you 120g reef, 1/4" to 3/8" is fine. I use AcryLite FF. You can use AcryLite GP (cast acrylic) if you prefer. PlexiGlass is a name brand, I believe.
1/2" is way overkill. My own sump is 3/8" acrylic, and it is 60" x 36" x 16".
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