If you want the dragonets, go for it.
Don't be put off by the common advice that you need a billion pods in a billion year old tank.
In general in this hobby, I find most happiness when I am aware of the common advice, but do not let myself be a slave to it.
In the long run, how mature your tank is and how many pods you have is fairly irrelevant to their success. Much more important is whether or not you can get them eating prepared foods. If you can get them eating prepared foods, you will be successful, otherwise, probably not no matter how big or established your tank is. They starve on pod-only diets even in big, established aquariums.
I was able to get mine eating PE mysis. After a short "break-in" period using targeted feeding with a turkey baster, he would swim out and actively compete for it with my big fishes. There were basically no pods in the tank I could ever see for him to eat.
He was always fat using the PE mysis. Here is a pic I took of him. I fed once a day or less (for several years)
I've been thinking about setting up a 2.5G or 5G tank with a pair of mandarins.