1/2" would be fine for 21x21x21 with eurobrace. I would recommend buying new acrylic, because you don't want anything with hidden scratches, or if its bent from standing on end.. I would recommend weldon 4 and the 'pins and shims' method (thin wire 0.014" for 1/2). Get scraps for practice welding, and how long it takes to melt the acrylic for bubble free joints. Cellcast and extruded welding times differ with environment
I recommend reading the best thread on acrylic ever. Lots of good advice and pictures
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
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