First off, 36g is too small for a snowflake eel, he may get up to 30 inches, nevermind in there with a lionfish... way too small. I have a snowflake myself, right now he is in a 75g with 2 clowns, a coral beauty, wrasse and a few others. Im setting up a 55g just for the eel. I dont want him going after my smaller fish when he gets bigger. Hes about 10-11 inches now and is eating silversides that are bigger than some of my fish. The more he eats the more rapidly hes gonan grow. you may want to look into a bigger tank for the eel.