Are you dosing Kalkwasser? Highly recommended for initial alkalinity and calcium dosing. It’ll also make the coralline grow from my experience and it’s a cheap way to stabilize parameters.Thanks! My apologies for the blurry pics, lol. I now count 11 spots throughout my tank, but 2 are iffy. I should know more in another week or two. The one thing that puzzles me is my alkalinity was low (6-7 dKH) for almost a month, and calcium also (340ppm). I bumped my dKH to 9.5 and it seems to be holding. Still working on the calcium, but it's about 380ppm now. Just funny how those spots all just showed up.