these are the basics, you'd need a strong filter and skimmer that's rated (or overrated) for your tank size. also you need strong lighting and powerheads so there are no dead spots (no water movement). live rock is a must for coral and later a clean-up crew is a must. these are the basics are there are many more things to consider like sumps, chemicals, fish, e.t.c, which i am no real expert on!