I agree with everything that J83 has said. Another tip is to keep your parameters stabile and consistent.
Do things gradual or you risk tissue recession, bleaching, browning or stunt growth.
Things I worry about the most:
1)Calcium/Alk/Mag - Keep these numbers where you like them..adjust gradually if they get depleted. The key here is to make sure you test frequently.
2)Temperature - keep your temperature stable. Avoid big and wild swings ie. 10 deg in one day
3)Lighting - Make sure you don't over or under expose. Overexposure will lead to lighting of corals..underexposure leads to darkening. If you need to make adjustments..do so gradually.
4)Water changes - do them regularly..even if your P04 and N04 are zero...you will replenish trace elements.
Hope this helps.
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