While at the LFS yesterday I met two of the reps from Kent. I asked them about Calcium levels and they both said Kalk is the unquestionably best product for raising and maintaining Calcium. They said the form or calcium in the two part lowers the pH and thus depletes the alk, this is why you have to add the second part, to restore what was already there. They both agree that Kalk is much better.
They also said SeaChem Reef complete and Reef Calcium is a nice treat for coraline algae, Calcium Gluconate will speed up the metabolism of corals including coraline algae but they can get "tired of it" too much of a good thing I guess. They said to use it once in a while and everything should be great.
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