If you're getting the tank custom built, I would seriously consider doing the coast to coast overflow into an external overflow box, then you have no worries about drilling the actual tank and can do a proper herbie.
I had a coast to coast internal in my last tank (5 ft) but in this one went to a smaller external overflow box. I'm much happier with the external box but am kinda wishing I had done a coast to coast overflow instead of just 12 inches. That being said, my wavebox would NOT work as well if i had done a coast to coast so I guess it's a bit of a trade-off
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