I switched to brs 2 part a week ago. I took my readings and used the calculator and got my levels right. By right I mean calcium at 420 Alkalinity at 9 and magnesium at 1420. Since then every 2 days I test and the only thing that changes is my alkalinity it drops to 7 every other day but nothing else does. I've used an api test and salifert test same result. Even did a 30 gallon water change still same. Any clue wtf???