Ok, so I bought a tank and live rock. And one snowflake eel was inside the rock. It survived through a lot!. Even survived outside the water for 5 to 10 minutes. I want to have a reef. Currently I only have a damsel and the eel. I have Hermit crabs and snails. The eel is eating my crabs and snails..... I honestly do not know much about the eel ( like I said it was a surprise to me). I feed her/ him shrimp from the grocery store. Seems to like it. She basically attacks my livestock and do not eat them completely. And my nitrates levels are rising, I have done a lot of water changes. I try to get the dead out but sometimes it is impossible as they die behind live rock. How should I take care of this eel so that It stops eating my crabs and snails?