It'll grow back. But I'd also try to find out whats making your calcium go down.
There may have been enough calcium in the salt mix to get a small amount of algae growing.
But when that was depleated by the algae growing it started to bleach.
If you don't suppliment calcium just coralline algae alone can consume a good ammount of Ca and that's probably the reason why it's low.
It's great to have a rock with coralline to get things going.But without calcium/alk and Mg. supplements.Or a really good quality salt mix that many nano tank people use.
It will be short lived.Coralline growth and health is a great way to tell if water parameters are right for sps,lps.Calcium also helps snails and shrimp to build healthy strong shells.
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