1-Tank,2- stand, 3-skimmer, 4 light,5 Live rock 55#'s, 6 heater, 7 sand, 8 salt, 9 Reverse Osmosis water(either buy it from a local fish store every 2 weeks or get a water purifier, 10-probably 2 powerheads for flow like Maxi jet 1200's.. so those 10 basics. Id really recommend doing research on a hang on overflow for your 55 and getting a sump going. its really simple and is a dream for keeping all of your equipment. I have a 55 with a hang on overflow. PM me your e-mail address and Ill walk you through the process and give you some tips on what equipment you can get to save money and where... -Zach