Hang on back over flow boxes for reef tank

it is easy... just put it in the bath tub and turn the water on... have the water on while using the diamond drill bit... also people put tape on the back to prevent unwanted cracks. then start with the bit slightly angled, the slowly level it to the tank and go all the way through with the drill.the water acts as a wet saw to decrease friction and cut the glass. you can also achieve the same effect with a spray bottle, but i much prefer constant water and both hands free, a helper might come in handy for an extra pair of hands.
 
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