LionFish says.....
Being that you will have sharks you can put the more aggressive eels in the tank with it. You can have a snowflake or chainlink, which are the smaller and more peaceful eels with a Horn shark. Where as, you can get a Tesselata or Jewel Moray or Zebra Moray with the Bamboo. those are the best kind of eels to go with those particular sharks. Avoid Blue Ribbon eels as they are nearly impossible to keep and it would be a disaster with a shark. A Green Wolf eel would work with the Horn shark. Also avoid the Giant Green Moray which can probably consume both of those sharks. You may also want to look into BlackEdge Morays, they are pretty cool.