What would you do - my LFS suggested that with my new corals I need to be testing for calcium, magnesium and alkalinity so I asked her to suggest a kit. She recommended the Red Sea Foundation kit and I bought it for $89. when I got home I searched for info/reviews on it (I‘m a nut for reading reviews) and saw that Amazon sells it for $59 as well as other retailers online. To me, $30 is a bit of a markup. Heres the issue, I feel like it’s overpriced and that makes me feel like I was taken advantage of but I like to shop local when possible. I’ve also read the Salifert tests are good and maybe easier to use. I’m a bona fide moron when it comes to math/science. Seriousl. I’m worried Red Sea might flummox me and I won’t want to use it. I do a 15% water change every Saturday and test salinity with a pen type gadget or my refractor. last test at that same store they said my tank looked great. I buy saltwater and RODI from them each week and use Seachem Reef Plus a couple times a week. I hope y’all aren’t cringing too much. Everyone in my tank looks good. Should I return the test and go for cheaper Salifert or keep it, learn to use it and chalk it up to lesson learned.