I'm in the planning stages of adding a refugium to my running tank and wanted to get advices on plumbing it. Here are the options I've been tossing around:

1) T off of the return pump from the sump to drive water into the refugium and then allow gravity feed into the return section of the sump

2) Since my tank has two drains, instead of having both plumbed to the Sump, plumb one of the drains into the refugium and allow to gravity feed into the return section of the sump.

The tank is a 180 gallon Oceanic with two overflows, so two drains currently plumbed into the sump, houses a skimmer, then flows into return section that houses a Mag 9.5 that is then plumbed to a single return in each overflow.

What do you think?

I'm looking for opinions / options.

-Justin