Nocturnal Duncan Coral.

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Polyps retracted during illumination.

Lights out, polyps extend, all night.

First sign of light, polyps retract.

Nocturnal ?

Water parameters all good.
 
Tidal Gardens
Top Shelf Aquatics

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WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

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    Votes: 13 16.3%

  • A coral looks different or stops opening normally

    Votes: 49 61.3%

  • Water clarity or surface appearance changes

    Votes: 12 15.0%

  • Equipment sounds or flow seem different

    Votes: 9 11.3%

  • A test result catches my attention

    Votes: 17 21.3%

  • Algae or other growth starts changing

    Votes: 16 20.0%

  • I usually notice when the problem is already obvious

    Votes: 4 5.0%

  • It depends on what’s going on

    Votes: 16 20.0%

  • Other (Post in the comments)

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