diy overflow

[skratchiechan]

so I'm making a u tube style overflow
http://www.aquariumlife.net/projects/diy-overflow/70.asp

and was wondering how much water is going thru this box? if any of you guys made this overflow box before...

I wanna make sure I get the right return pump for it

[afitzwater]

Let me know if I need acrylic I have some u can have