Drain Hole size

[Fragmented 99]

Not new to the hobby, but will be purchasing my first tank drilled for an overflow. The tank will be 120 gallon 48X24X24.
I couyld use some help with these questions:

What size drain hole should I have drilled 1 1/2" or 2" ?

What type of bracing for the tank works best, standard or euro bracing?

I plan on supplementing the return with 2 power heads ( Seio 620s) for circulation.

From what I read, turnover S/B 10/15 times the tank volume, So I was thinking of a returm\n pump volume of 800-1000 gallons per hour. Is that to much?

Any performance difference for center or corner overflows ?

Any suggestions for a quiet energy efficient pump.

Thanks

 

[bertoni]

http://www.reefcentral.com/calc/drain.php

That page should help with sizing the overflow.

Center vs corner is mostly an esthetics issue, IMO. I'd go for corner, to avoid getting in the way of the rock setup, most likely. If you want to view from both corners, though, center might be best.

I can't help much with the other questions, but do you want an external or submersible pump?