If you have an old style cutter. You can take the back end of the cutter, the ball and tap the glass to make the crack run. Not too hard. This is the only way you can cut a inside circle out. The main thing is to make one single score and not pick up the cutter. Any slight off cuts can make the crack run out the wrong way.
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Tank: 125gal money pit
Current Tank Info: 125gal, 55 sump with fug, 3x250MH, 2x60" VHO, Euro-Reef RC250 skimmer, Ca reactor, ATO Kalk, 2500gph closed loop
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