These little ones, like most dragonets, can be difficult to sustain because of their dietary needs. It's not often that they will accept frozen or "fresh" dead meats, but rather, prefer live foods. They are snackers, meaning that they won't just come out at feeding time, take their fill and be good to go until the next round. Rather, they sift through sand beds, and cruise along live rocks looking in all the nooks and cranies for juicy little bits. They are best kept with a mature tank, and that's because over time, resident populations of copepods, amphipods and other micro-verts are generally well established. Baby brine shrimp are a popular favorite too. They can decimate small populations rather quickly, as their metobolic rate is a touch higer than others, not to mention, digestively, nutrients aren't abundant in some of their prefered foods, which results in a higher intake demand. Best thing to do would be to buy live stock of these (copepods, amphipods and brine), and introduce them into tank, as well as establishing a "feed tank" maybe 2-3 gallons, with a simple filter, and some macro algae and small live rocks, to allow these populations to soar, so that you will have a continual food supply. For the first few months, I'd recommend adding about two cups worth from your feed tank, to your main tank about twice a week. This not only replenishes the animals your little buddy picks off, but introduces additional ones into the tank to start establishing a resident population. Additionally, they have been known to snack on fresh algae as well. I wouldn't rely on this as any major dietary supplement, as these guys are primarily carnivorous, but it will provide with additional vitamin boosts to them should they choose to nibble. This is easy to achieve at home, get some rocks, a quart sized jar or larger, and place it in a window with direct light. Algae will grow quickly in right conditions, and once it gets past the "slime" stage and achieves the "hair" stage, just grab the rock and place it on the sand bed. Other herbivorous residents will thank you as well.