Eels are mostly scavengers on the reef. Large meaty chunks of food are best to feed. Use long tongs to hold it close. They will hunt if they have to but feeding live foods only encourages them to go after display fish.
Also using guppy and freshwater ghost shrimp is not providing a proper diet to them. Saltwater fish are higher in oils and nutrients that they need to maintain health. If you have to small fresh frozen silversmiths chopped up, and frozen krill are also options, but the class normally trigger the fastest feeding response.