So I finally got fish in my tank and now I want more lol. 3 days ago I got a coral beauty, a red striped goby ( I was told it was called a watchman but all I can find called watchman have spots mine has red stripes, and a banded coral shrimp. I am so excited to finally have fish in the big empty tank lol. So my question is we really want an eel. We have decided to do a half reef tank our fish guy said if we don't do any really fragile coral or have small fish we could do it. We have a 120 gallon tank what kind of eel do you reccomend?