Sump Inhabitants

[Alarmguy66]

OK, I love to look into my sump and see whats going on. Its a 55 gallon with the center 2 feet operating as a refugium. I have cheato, sea grass, 5 inches of aragonite sand and a few live rocks in this section, which is lit 24/7. Other than the pods, snails, worms and a serpent star that found his way into it, there are no major inhabitants.

Im looking for something to add a little life to the sump, without eliminating the pod population or eating up all the macros. Any Ideas?

BTW, after a feeding, some food does make its way to the refugium, but not much, and Im not going to add food directly.

 

[MAPA]

I just ad the same idea last night, while observing my sump. I have just amphipods running around (very funny guys), I wonder if they could be proliferated by additional nutrition or something just to get them to the main tank to feed my mandarin.
BTW they suppose to clean so adding food is kinda in opposite direction.