a beginner marine tank enthusiast should start with a smaller tank (empty of life forms) and run it for serveral months.as the water evaporates the salt does not...so you have to add dechlorinated water to your established waterline alot....its an everyday ,monitoring constantly kind of thing until the proper conditions are achieved in your biological filter....and until you have the knack of keeping the saline levels steady...powerheads create a ebb and flow like the tides...and the proper lighting is crucial to things like anenomes...most aquarium owners unbeknownst to them do not keep their aquariums right either..they just have "unsensitive" fish.i went to salt because i was told it was easier than keeping the Discus that i was doing at the time...their water had to be softened,made acidic...all that stuff...the water was totally atthe other end of the scale out of the tap than it needed to be when it went into the tank...had a generator for power outagges...big pain,but really beautiful!.
20-30 gallon with coral sand,a bio-filter dumping back through bio-wheels...for a month(s) before fish...that is what scares most people away or leads to their failure due to impatience to have fish.
if i lived by the actuall ocean i would have one ,water changes every other day from the ocean ould make it very easy
...i think i actually clapped 
