What kinds of plants, is your tank cycled, if so how long has it been established? Look at different threads by clicking on search at the top right of the screen and look at other people's set ups. I'm new and have a 55 also, but I do know your tank has to be established for atleast 4-6 months before you can successfully add anemones. As for plants, I have no idea because usually people only have live rock and live sand. Normally I only hear of people keeping plants mostly in their sump. They help to filter out nitrates.