Might I add, I have had success with wild-caught mandy and scooter blenny, neither of which eats prepared foods, both in the same 54 gallon with 60 lbs of rock and a sandbed---WITH!!!! a 20 gallon fuge, packed with cheato, rock, and sand. The fuge supplies copepods, mysis, and amphipods, and has crabs, worms, dusters, and several mini-brittle-stars that are growing into real starfish. It can be done: but that fuge is not optional and I would not recommend anything under a 50 for a single dragonet. As is, they have plenty of territory to explore, being different species, do not acknowledge each other's existence, and they are both fat and healthy.
Re your question, Saltymight, a thick, healthy mass of cheato is a good breeding ground for pods, with rock and sand; feeding mysis (frozen) to your other fishes may also loose mysis eggs into the system, which is where I think mine came from. I have an Iwaki 100 (basement sump) which spins at an ungodly rate, and not only do pods make it upstairs undamaged, so have amphipods. They'll get there. No need to siphon them. Observe the rate of 'hits' made by your mandy while feeding, and you'll see he's getting something. I don't think they often miss.