If you get a little one, you'll be able to keep it in the 105 for a while, I think...but they will grow BIG...up to 5' full size. They are VERY cool eels...but aggressive, and big-time fish eaters. Be sure to never add fish to your tank
What other eels are you thinking about? There are lots of cool morays. I always tell people to get Reef Fishes, Vol. 1 by Scott Michael...there is a nice, big section on morays--care, tank size, feeding requirements, maximum growth size, etc. Worth the price tag for sure...