My 75 gallon with 40 gallon sump, has an algae scrubber, which supplies enough pods (and amphipods) to support 2 pairs of dragonettes in the main display and 2 more in the sump. (that's 8 individuals) Another key to help support food production is to use #5 gravel, (or mixed with #2 coarse sand), which is a refuge for the amphipods/pod colony, as opposed to bare bottom or sand, which, they can not build their breeding nests in. (a half inch depth is all it takes for the amphipods to colonize). Currently I have colonies of amphipods breeding in the gravel bed, and also building "mud-like structure" colonies in fishless zones, (ie the overflow box, pipe out flows, etc).
I feed heavily, broadcasting daily (no target feeding) with ground and powdered foods, which supports the food chain from the bottom up.