To Drill or not to Drill?

[GravesSpeaks]

Background:
I am converting a 50 gallon bowfront into an orchid tank. I plan to have all of my orchids mounted and above the substrate (3" V2 NEHERP). There will be jewel orchids, ferns, goldfish plants...whatever else I decide to try in the substrate. This substrate was selected because I think it will be particularly fast drying.

The Point:
So, I wasn't planning to drill this originally. Just carefully balance the moisture with my Mistking system and (if all else fails) suck up any excess water. HOWEVER, I realize I will probably be drilling 9/16" holes for the mist nozzles in the lid of my tank anyway...should I go ahead, take the chance and drill the tank as well? It is currently bare bottom.

If I did...what size bit would I need?

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