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sounds like everything is being done like it should be.
See what your ammonia, nitrite and nitrate are and go from there.
a side note: live rock should develop a slow growing purple velveteen algae on the surface over time; if this does not happen, the calcium levels may be to low. Instant ocean is good salt for this setup; I used reef crystals to maintain my inverts' trace element levels. It may help add more purple to the live rock. This costs more but worked well for me. The inverts thrived and the rock looked was solid purple.
Otherwise, calcium supplements and test kits are relatively cheap and effective.
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