Refugium for food propagation

I have tons of copepods, amphipods, as well as hundreds of different sponges in my refugium. I never really have to replenish them and some get sucked up to the main tank to feed some of the inhabitants. The copepods and amphipods make their way into the display, and some of the larval stage sponges also get sucked into the display where they will sometimes grow but are caught by corals most of the time. I wouldn't count on being able to cut down to much on feeding your fish, but my corals get plenty to eat without to much target feeding. 

Mark, I've actually been trying to work out the best way to implement a cryptic and a RDP zone in a refugium. The tank is in the early planning stages right now, but I am planning on having a basement fish room for the sump/fuge, so space wouldn't be a really big issue.

Would it work to have the water pass through a cryptic zone with lots of LR and LS and then go through the RDP portion with the macro and a small amount of LS and LR rubble before it got to the return pump? Or would the light in the macroalgae part (which might even be left on all the time) keep critters from finding their way to the return pump.

Would it be better to have two separate refugiums or water paths in the fuge to keep them apart until they got to the return pump, or even two separate return pumps at the end of those two routes?

Am I over complicating this?

Thanks both of you for your input so far. I'm so glad I found the WMAS before I started buying things and setting things up. I'm really looking forward to the meetings and seeing how people set their tanks up, but this forum alone is worth the membership fee I paid.

I agree with Steve, though a separate cryptic/benthic refugium can be really cool because the entire tank fills with sponge growing all different directions. In my fishy travels I would see a bit of sponge at the LFS or someones tank and bring a piece home to see how many different kinds would grow together.

I'm sure either way would work.

This one was three tanks. It started with a customized extended window sill of a south facing window to hold a major macroalgae filled 15 gal tank. This overflowed to a 30 gal fish and coral tank, which overflowed to the 10 gal cryptic zone tank where a powerhead pushed the water back up to the 15 gal in the sunlit window.  This was in the days before digital cameras, but I believe I have a VHS tape of it. It was awesome if I do say so myself.

It was the first time I saw Sargassum/Kelp growing from LR (~1997) and growing on that Sargassum were some kind of hydroids being eaten by a curious looking kind of Nudibranch. I'll have to look for that tape and find someone to help me transfer it to digital and post it.

Would dosing phyto be a way to augment all the other populations, pods, rotifiers, mysis, etc.