the dragonet is a butiful fish. they also eat brine shrimp. but probably better to wait until the tank is more established.
Nooooooo! The dragonet MAY eat brine shrimp but 1) they normally don't take to the brine shrimp and slowly starve to death because they normally only eat pods and 2) brine shrimp really have little to no nutrition unless you set up a hatchery, hatch your own brine shrimp, and feed them when they first hatch.
Don't get that dragonet even a year from now unless you 1) know that you have enough pods and the ability to keep a big population of them (like a refugium or something) OR 2) you find one in a store that you see firsthand is eating other things and doing well! Don't take their word on it no matter how well trusted they are! Insist on them feeding it in front of you so you can see that it's eating the given food!