well you added sps and stopped using your kalk, so it makes sernce your Ca is going to drop.. you alk is high but not that high (I used to keep mine about 15 all the time. I would add a Ca additive only and bring your Ca up to 390 to 410 and see what you alk does (itr should drop a bit) and if it doesent drop just maintain you Ca untill it naturaly drops. you PH isn't realy that bad.. normal rang for PH is 7.8 to 8.2 so you are on the low side of normal. mine is a constant 7.9 and I hacve no problems.
Steve
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