Is it just me or do you find saltwater fish to be hardier and longer-lived than common freshwater fish? It seems that once a saltwater fish makes it past quarantine disease free, has a robust appetite, and is kept in a well maintained tank, it's good to go for a good many years whereas I'll have freshwater fish - with the exception of large cichlids and pedigree and more expensive specimens - drop dead with frequent water changes and good diet. I just find saltwater fish easier to keep.