One more vote for the glass drills from Ebay seller lau++. I got them pretty quick (for Hong Kong) and used them to quickly put two 45mm holes into my new DIY 20G sump. It was very easy, after a little practice. I recommend that the inexperienced (like me) drill a couple of test holes in an old 10G or some scrap glass. I was managed to crack out a couple of holes before I realized I was leaning on the drill. From then on (supporting the drill) it was easy.
I used plumber's putty to hold some water around the site, and clamped a piece of scrap wood to the tank to catch the cut-out. Beautiful!
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Jim Roth
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Current Tank Info: 250G custom SPS System w/3X Radions
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