Is it possible that any LPS are stinging the SPS?
There is wishy washy talk of some softies (leathers I think) secreting compounds that inhibit/slow growth with sps, but carbon removes this. Are you running carbon?
A bit higher Ca is good and also it's optimum to have low, preferably undetectable, PO4 and Nitrate too.
Some sps are slow growers but you should be fine with digitata and caps.. I wonder whats up.
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