SW tanks take much more of your time, and much more of your money. You will need alot more equipement, and alot of reading and talking to someone who really knows what they are talking about. If the LFSs tanks look healthy, then they probly know what they are doing. If you see unhealthy looking fish and tanks that are in bad condition, go to a different store.(They wont know anymore than you) Cross check what they say with what is posted on this forum. ASK LOTS OF QUESTIONS!!!! You can not ask a stupid question, if you dont ask and kill off a tank of fish and other critters, well, that is what is stupid. If you dont have the time or the money, dont do it.