First of all Welcome to Canreef, now that we have got that out of the way the bigger the tank the better 90 gallons is a good place to start if you can go bigger great the reason why bigger is better is because if your quality of water starts to degrade you will have time to act and do something about it small tanks although great can go south in a matter of hours a large tank gives you days to deal with it dont be cheap with what ever equipment you choose and lastly when selecting your live rock use your nose to tell you if it is cured or not, un cured live rock will smell really foul your best bet is to buy all the live rock at once that way your tank will have only one major ammonia cycle secondly if you intend on buying sand dont get sucked in by live sand there in my opinion is no such thing your live rock will seed the sand good luck and remember you are about to embark on a really expensive yet rewarding hobby
