overflow advice

I am buying a 220 gallon tank today used from a local aquarium shop. It is not reef ready but he offered to drill it for me for free. He said he can drill the back of the bottom, whatever I wanted. He said its an oceanic tank so it can be drilled anywere.
I have never had a reef ready tank before, I always used the hob boxes (and hate them). where should I have the holes drilled? after he drills them what do I need to finish the project? I have seen holes drilled in the back towards the top, how does that work? If power goes out wont I get a bunch of water on my floor?
Thanks.

 

Maybe someone can link you to bean animals site. I would definitely do a bean animal setup on a tank that big.

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I would recommend going for holes on the bottom then put in Durso or equivalent drains for noise reduction. Get an internal overflow box made out of acrylic and install around the holes.

As for location, it totally depends on which sides of the tank you will be viewing. If you will have it set up to see through the ends if the tank then drill the holes in the middle/bottom and put in a mid-tank overflow.

You may also want to drill holes for returns, though it's also easy to run the returns up over the edge of the tank.

For the drain holes, drill 1.5" holes.

 

BeanAnimal's Bar and Grill - Silent and Fail-Safe Overflow System

Silent and Failsafe Overflow System - Reef Central Online Community