HOB Overflow Box or Out Pump?

[gobytron]

Originally Posted by Midway

I could always use ball valves in both pumps to decrease or increase the flow.

Yeah...
If you want to adjust them daily.

I tried this on a nano with 2 MJ12's and I'm telling you, it's not possible unless you are ready to adjust daily or more.

Whats the hang up against an external overflow?

WAY more simple than the dual pump idea IMO...