Refugium Water Source

[naesco]

Originally Posted by intarsiabox

I think that's what I'll do. I put one valve on one of the drains to direct some flow into the refugium but it looks like I'll have to add another after this valve as not much seems to be actually getting to the refugium.

IMO the best way to attach a refugium to your system is to tee off the outlet from your sump. You need to throttle it down because you want slow flow through your refugium.
The outlet from your refugium to your main tank is gravity feed and located near the top of the refugium, provided that your refugium is higher than your main tank.

The purpose of the refugium is to provide a super breeding ground for pods and other critters(without predators in it) and provide a space for macro to grow to assist in removing nitrate from you system.
Pods and critters eggs flow undisturbed without a pump into your main tank.