Randy Holmes-Farley
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I have purchased multiple sps on line with stn that recovered quickly, there colors never faded and showing signs of rapid growth. I only dose kalk and part c in a 100 gallon total water volume
I would just caution that the result may be inspite of the Part C and not because of it, and the accumulation of sulfate and other ions may continue to get worse.
it is adding magnesium, which is likely good, and potassium, which may be good, but driving up sulfate and lots of other minor ions may be undesirable.