I personally think that you should get as large as a pump as you can (within reason of course) for your tank and connect a ball valve to it. If you find that the flow is too much, you could always close the valve a bit. I was a bit paranoid when I plumbed a mag9.5 onto my 30 gallon (since I already had two MJ powerheads in there)... but it turns out I like the amount of flow going through my tank, so I've left the pump going full throttle. I've heard that one 1" drain should be enough to handle about 800gph of drainage. Two 1" drains should work well for a mag9.5... it gives you the extra drainage capacity incase one of the lines get partially plugged up. I know that in my tank, I can literally stick both my arms all the way into it, and the drains handle the extra flow without breaking a sweat.
I think Dez has a template made for drilling 1" holes... complete with spacings and stuff. At least, it looked like he had one when he drilled my tank (two holes for two drains in the middle back of the tank). Maybe see if you can borrow that from him?
-Richer
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