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Bummer about the tank. Most glass glaziers drill from both sides to help minimize chips and cracks. You drill half way through one side then the other half from the other side. It really is not necessary but you definitely minimize chips and cracks.
Also, a cordless drill is helpful. The reduced torque (compared to AC drill) is much easier to handle. You can also use the drill clutch to minimize the kick if the bit binds up add to prevent you from applying too much pressure. Adjust the clutch so it will slip if you press too hard on the glass.
I was going to then decided to stick with the 40 breeder. I like being able to brag about how much I built myself.oh darn!! I though you were gonna upgrade to a 65 RR?
This may sound counter productive but I used to have to drill alot of glass for my job and I noticed that like mentioned above use a cordless . Also towards the end pause for a mine off of the glass to let it cool which happens rather quickly. Then run the drill at fast speed and with only a light weight of the drill for pressure begin cutting. Have a firm grip. This fast with low pressure cutting essentially let's it grind through it slow instead of cutting a big chunk and catching on the lip before it's 100% cut causing it to jerk and Crack the glass
I already have a sump and everything. I am building a new display tank after some house guests scratched mine up while I was out of town.Maybe you can cut this one up for glass baffles to use in the sump, so it's not a total waste.