eel-like

So I am going to get a 10-15 gallon tank and plan on stocking it with: 2 clown fish 1 goby 2 shrimp 1 Tuxedo urchin 1 small harlequin serpent sea star And some coral as the tank progresses. I would really like to find a small eel like fish that would be able to live in a tank this small. I’ve...