The best guide I found was to drill through a wood like. 1x4 long enough to hold on to while I started the hole in the glass. Then tossed it aside once I was 1/4 way though the glass. Then you'd finish. Sand the rough edges then DONE. Mission accomplished.
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I believe Reefkeeping is not a hobby but a way of life It's unfortunate mine is at a stand still!
Building a 135 reef 9 years in the making(seem like I'll never get this 1 together! Too Busy with the Nano and Pico tanks
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