Getting An Overflow Box

[1234-fishy-freind]

Hi guys.
I have decided to get an overflow box for my fish tank, that way, i can cut out the really ugley black pipes in the middle of the tank.

I was wondering though, how much water will I need flowing down into the sump?
The tank is 100gallons, is there a general rule about how many LPH's should be going into the sump?

thanks
josh

 

[1234-fishy-freind]

anyone?

 

[SkiFletch]

Late to the party but somethin like a 600gph overflow box would probably be ideal