true reefs need waters to be within a consistent range...

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    true reefs need waters to be within a consistent range pre-dating 1970s. the range has shifted well above and this is why we are now getting coal bleaching over such wide (>60%) of the reef.

    but there are corals they've recently discovered growing at the bottom of the trench off the Qld coast. > 1 km deep.
 
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