Ideas for 55 gallon?

[firefish9]

I am going to be setting up a 55 gallon aggresive pretty soon and I was wondering what to add so far I want a snowflake eel and a bannar butterfly. NOT THE MOORISH IDOL,THE ONE THAT STARTS WITH AN H. I just can't spell that word.Thx in advance

 

[fedukeford]

snowflake will eventually get to big for a 55, and im pretty sure henchious butterflys need bigger tank, but im not sure