Wow...I don't know if it's just the way the name sounds, but I remember coming into this hobby 3 years ago thinking Oceanic was a reputable company.
To answer your question, you can drill any pane except the bottom pane. It's tempered on most tanks, and tempered glass cannot be drilled (it will crack into a million little squares).
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90g reef/29g sump, DIY cabinet, 2x250w MH, 2x54w T5 actinics, ER RS135 skimmer, VorTech pump, 18w UV sterilizer
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