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[danny zubot]

I stopped adding anything, the funny thing is, my calcium is around 250

That happened to me a while ago. My Alk was too high MG was pretty high and PH was about 8.5. The best thing I did was nothing at all, accept a couple of small water changes, and my levels returned to normal after a while. Sometimes when adding buffers they don't mix right away and cause irregular readings, expecially Calcium. You might find that your CA levels will raise all by themself if you leave the tank alone.