The Planted Tank Forum - View Single Post - Reconstructing a 40 breeder
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Old 11-05-2012, 05:08 AM   #3
Hoppy
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From http://www.theaquatools.com/building-your-aquarium:


From that, if your 40B tank glass is 6 mm or thicker you can remove the rim and it should be safe, with a safety factor of 2.5.
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