my blue damsels and pic of my tank attached

[harrypotter41]

Greetings all, I'm new here and intend to hang out for awhile. I have just finished cycling my 55 gallon tank and love my blue damsels. We have 4 of them. I know there aggressive. Can you guys recommend ANYTHING to put with them if I wanted to keep them or do I need to part ways with the little guys?
thanks so much,
casey

any thoughts on the pic of my pic....critical suggestions are welcome...