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I use CalCarb, on my clones.
The label doesn't specify a ph, so I just keep it around 6.6-6.8, for better Calcium absorption.
That is about the same range I use but I add stuff to it, cal/mag or Epsom Salt, kelp, amino acids, etc. basically the same stuff that is in Flourilicious Plus. I do like that cal/carb from Xtreme, except the white specks of cal it leaves..