I use 5mm for glass tops. I would NOT trust 6mm to be strong enough for a tank. What's the point of saving money if you won't be able to get a good night's sleep knowing any little bump will cause 50+g of sw to flood your place?
2' cube tanks are about $280 around here. Not rimless though. I would be comfortable taking the trim off one of those tanks though and polishing it up nice.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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