+1 on the fuge.
ORA breeds dragonettes, but not green ones. However their blues, reds, and spotteds are very pretty and they are all raised eating prepared foods.
I have a green mandrin "goby" and got it when the tank was very young as an impulse buy. I highly suggest against it, however if you go against that advice make sure to get a large container you can hang on the tank that has tank water flowing through it, and then you train them to eat before you let them into the tank. No matter how long it takes, make sure they will recoginize and eat prepared food BEFORE you release them into the display tank. There is the possibility that he will starve to death before he learns to eat, so this could be a heartwrenching process, which is why I dont recommend it.
They can be trained to eat a variety of things, mysis shrimp seem to be high on the list, I know mine LOVES nutramar prawn roe.
Mine is over a year old now, and is both fat and happy. He had to live in a 5 gallon tank with basically nothing in it for about 2 months of his life and survived quite well of nutramar prawn roe that whole time.