Out of curiusity, what background knowledge are you building this tank from? I mean, did you do any research before you started out into SW?
The tanks looking good. You have a green brittle star, green serpent, either way. It will get big and could eat your beloved fish. It will most likely ourgrow the tank you have it in, or die from starvation before that happens. They get huge, Ive seen one on here that was over 24". Surely too big for a 14g. It will take some time, though. So you should be good for now. Keep an eye on him. Hes looking great.
Mark