mushroom_man
New Member
I have the Hagen master test kit, and when testing my calcium it I continuosly get readings of 540-560ppm. Is this test flawed? I find it hard to believe that a lot of people have trouble maintaining 400ppm and I am way over that. I use RO/DI water with instant ocean, and my tank is lightly stocked with LR, LS, a few fish and a few corals.