I was given a 40 breeder with an 8yr old, 20 inch snowflake eel. He was very aggressive but I have been working with him and his is improving. I am setting up a 90g for him and I was wondering what I should/should not try to put with him. I am hoping that he calms down a bit more once he has more space. He is getting more food now too so that helps. What is best to be feeding an eel this size though? I have heard of feeding them tilapia but is freshwater fish okay for him to eat?