i use sea water that i buy from the fish farm. personally i think its good coz so far my small zoas, feather dusters, and livestock are doing great. mabe they survice coz they are the hardy species. lol. anyways ive been using them ever since i started my tank back in november 2010. for a start if you dunt wish to get those water purifier and mix ur own salt, you can go for the sea water option. since urs is a nano like mine, it shouldnt be too troublesome to buy a few bags of sea water once or every two weeks for water change. so far its been good for me. Btw I couldn't comment on salt coz ive yet to use them. perhaps other with prior experience could offer some views on the different brand of salts they use. anyways happy reefing!