No. A dragonet's a creature of small brain, and he's wired to eat just about one thing, and to recognize that one thing as food. I've had them for many, many years, and they just don't routinely eat anything but copepods. I've seen some that will eat pellet now and again, but right back to pods, and that's probably what they're healthiest eating.
I recommend cheatomorpha as the best for raising pods. It shouldn't be lime green, however: what is, isn't getting enough light of the right sort. Mine lives in a dark basement under a 6500k strong spotlight, and is extremely dark green.
Losing the mandy wasn't your fault, be that understood.