My understanding is that having a thicker bottom pane serves two purposes:
1) For the stronger bond, as I mentioned above
2) If you want to drill it, having thicker glass will obviously be stronger, and help maintain structural integrity
I have very little experience in this practically speaking, though, so perhaps others could chime in!
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz

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