Here we go:
http://www.tfhmagazine.com/details/articles/moray-eels-bitebut-are-they-poisonous-full-article.htm
Some clarification:
To this point it is believed that the crinotoxins of morays are not very dangerous and only lead to increased pain and bleeding. However, allergic reactions may be possible and are just one more reason you don’t want to be bitten by a moray eel. Those crinotoxins additionally support two general rules of tank maintenance: don’t reach into a tank with wounds on your hands, and don’t touch your moray eel.
Blood Toxins
Moray eels, as well as many other eel-like fish of the order Aguilliformes, have toxic proteins in their blood. They are usually referred to as ichthyotoxins, which simply means “fish poisons.” They are among the oldest toxic substances from marine critters known to mankind. Fishermen in general are aware of the fact that certain fishes have to be heated above 75°C (167°F) to destroy the toxins. Consequently, making moray eel sushi is not a good idea. Ichthyotoxin poisoning can lead to spasms and heavy breathing. These substances are also haemolytic and should not touch your eyes, mouth, or open wounds. Bleeding moray eels should be handled car
And the reason I got rid of my moray is because it bite me 3 times over a year when I was doing maintenance on the tank.