Since no one has offered up any advice...I will add what little I know..
Haven't kept dragon morays, but I kept a Fimbriatum and it was a KILLER. Traded it in when a large honeycomb became available (was searching for well over a year). They have bad eyesight, and can dislocate their jaws and swallow pretty large prey items. Their teeth are numerous, long and curved backwards, so be VERY careful, as they can give a very nasty bite.
I would really, really suggest getting the fish you want, and avoiding the Dragon Moray (or any other large moray) until it is absolutely the last fish you plan on adding to the tank. They grow very quick, and become pretty aggressive. I deeply under-estimated them. I hear it is a toss-up between the fimbriatum and the dragon moray for 'most aggessive' - honeycomb was 'tame' by comparison, really, and it was a handful. It is very hard to find large fish to add later to your tank with a large moray, and if you do happen to find something, good luck trying to get them to eat. Large saltwater fish usually just end up starving when they come in.