I have a 75g SW and its fun and a challenge but if you fish is what you like to do yea.Bigger the better,the smaller the tank the harder it is to get a hold of your PH level.SW its very hard to say i just what clown shrimp and 1 or 2 corals ,because then you go back to the store or see a post .Good luck with that.SW cost a lot more ,alot more.You can do a 20g tho ,but dont just go to the store buy everything and throw fish in it.Read Read read see what kind of tank you what ,see what kind of power heads you want to use , what kind of rock you want to us .Slow is the key with SW.Another site that i use for SW is www.reeffrontiers.com.They are cool guys know everything SW and are mostly local in washington