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Gailgs said:
from what i have been reading it is both the heavy rains and the sea temperature..apparently if they are not too damaged they do come back..but many do die

Many definitely die you can see that where part of the shore sand is above the dead coral, it's ongoing or when you walk into the water and stub your foot it's usually where there at one time had live coral.
The only thing we should worry about is a nuclear disaster.