I'll second the suggestions to stick feed ALL eels. I have a Brazilian dragon moray as well, which is out a lot more, but also more aggressive. BTW, my dragon moray, which about 2.5 feet, has been safe with my three angels, grouper and rabbitfish. However, it stalks and tries to kill puffers. And who knows when it figures out that a 4" angel is not that tough? So eventually (should have done it by now!) it will be in its own 90 gallon tank.
To reduce the chance of collateral damage during a feeding frenzy, I stick feed my eels and NEVER feed them fish flesh. They get frozen shrimp, scallops, squid, clams, crabs. Also, for variety, I feed them Ocean Nutrition gel cubes (whole cube on a stick) at least a couple times a week. These cubes, if thawed properly, hold together. The eels gulp them down like candy, and I mix it up - they get Formula 1, Formula 2 (for herbivores), Angel Diet, etc. I just think the variety is helpful, especially since the majority of what they get otherwise is frozen shrimp and scallops.
If you love the eels that are out and about more, have an eel tank with a Brazilian dragon moray, Japanese/Hawaiian dragon, tesselata, etc. These eels are not really fish safe in a community tank. If you want a fish-safe eel in a community tank, get a zebra moray.
Other candidates would be other "pebble toothed" eels that mostly eat inverts, such as the snowflake moray or chain link eels. Snowflakes are very nice, stay a bit smaller, and are a little less shy, IMO than zebra eels. HOWEVER, they are the worst about getting out of the tank and ending up dried up on the floor. They are also a greater risk with fish, so don't keep them with anything that can fit in their mouths. If you keep a snowflake well fed, stick feed, avoid fish flesh, and have bigger fish that can stand up for themselves, a snowflake is a possibility.
If you have a lot of money to burn, look up the rare skeletor eel, which has become occasionally available. The couple that were sold on Liveaquaria Diver's Den went for abot $600.
And as mentioned, bioload with any eels is a big issue, be sure your filtration and maintenance regime can handle it, especially with a reef.
Eels really do become pets. For the bioload reason, I have occasionally considered selling/adopting out my zebra moray, but haven't been able to do it. I've had this eel almost as long as my oldest daughter has been alive, and several years longer than my youngest daughter. I hope when they are out of the house that I'll still have the eel.
