could one of the below issues.
if your .system is SPS dominant LPS will not do too well and slowly wither away.
Water movement is a big thing for SPS but LPS need a more settle flow.
High emission light is best for SPS and LPS but need very slow and gradual acclimation although LPS don't require the intensity.
In a mix reef system its best to keep up with your Carbon as it removes all chemical warfare.
Are you sure the fish you have are not bothering or picking on your LPS.
Your water parameter seems fine.
Like the earlier post always a photo helps.
Are you dipping your new corals.
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