Overflow size for a 240 and a Sequence Dart

[reeftank21]

I would like some advice on what size my overflows should be on a peninsula stlye 240 reef tank. I'm planning on using 2 6100 streams on the inside to supplement flow.
The overflow will only be on one of the short ends. Should I have one 2" overflow or two 1.5" overflows? or something else?
Looking for about 2500 return gph out of my sump.
Also should I separate the two overflows into two chambers?

 

[Julio]

i woudl get 2 -2" drains on a tank that size with a pump that size.