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This is not a good idea on many levels. I would not drill a tank vertically (although I've done it). I would not drill a filled tank, even partially. Drain it, set it on the side, drill it.
I would never say they are weak. But you are either running a 30" wide tank, or a 30" deep tank, one way or another, it's a big tank.
Also what I mentioned, it depends on what you are trying to grow. I have a 72x24, I am running 3 XR30s and 2 Quantas (pretty similar to Orpheks).