Maybe I'm wrong, but isn't a glass cutter typically for scoring and snapping a straight line? I think only some sort of rotary tool like a drill or a dremel is going to get you a round hole.
For polyps and soft corals, you should be fine going with some cheaper T5's like chem-e suggested.
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Mathias
Hofstadter's Law -
It always takes longer than you expect, even when you take into account Hofstadter's Law.
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