What size tank is needed?
Almost any size aquarium can be used, but generally a larger tank will be easier to keep chemically balanced and has a lot more options when it comes to fish compatibility. On the other hand, assuming the household budget is a factor, it is better to set up a medium-sized tank with good equipment than to attempt a larger tank with inadequate equipment. Many of the most popular saltwater sizes are in the 30 to 55 gallon range.
