Did you buy it already?
If so, that's too bad. As the label states, it is tempered and CANNOT be drilled.
I had asked earlier what your requirements and budget were.
I'm always on the look out for good deals (just scored an AP700 n LeRusso stand for $625! O.O) and could have helped you locate a tank that would fit your needs.
If you have already bought it, there are a few solutions you can try.
HOB overflow or,
You can check if the back pane is also tempered and do an external overflow.
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