im glad you purchased your own test kit. sadly, but true some stores will tell you your water is "fine" only for you to impulse buy fish, only for them to die, for you to be back. ofcourse not every store has this thinking but they do exist. to make things worse, the minimum wage store employee may just not be as careful when testing as you would yourself, or its late in their shift and theyve been doing it for customers all day.
i personally would wait until i got my test kits. ph, temp, alk, mag, cal, amm, nitite, nitrate, and a refractometer ( look on ebay ) at the minimum so i could check myself. your also going to need something to dose for alk, cal and mag too.
have you had a diatom bloom yet?