Where are your holes drilled. What would you do

[pennyguy23]

I am trying to figure out where to put all my holes for my return. I was orginally going to put all of them in the external overflow box but they wont all fit. I need 2-2" and 3 or 4 1.5" returns. The overflow is on one side of the tank. Any suggestions of what you did would be great and pics would be great also. Thanks everyone. Its for a 300gl

 

[montepora]

I put return and CL holes on the euro brace.

 

[pennyguy23]

What is the euro brace?