Yea as above post us some details about your system
How old ?
Hog big ?
What lights ?
What are parameters ?
Any live stock yet?
This will help us answer your question , my gut feeling is tank is super new and cycling and coralline can die out a bit or lights are a lot brighter than tank you bought live rock from and its bleaching both are fine , but If it's been running for a while and this starting to happen different story
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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