Duncan coral closed up

Andreas' Reef

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My duncans are closed up. I don't know why they are unhappy? They are the only duncans in the tank.

Params:

Temp: 77 F

32 gallons

Phos: 0.01 ppm

N03: 4.5 ppm

Mag: 1400 ppm

Calcium: 400 ppm

DKH: 12.6

Tank age: 7 months
 
Last edited:
Has flow, light or position changed?
If not, occasionally mine will close up for a day or so for seemingly no reason.
 
Flow is moderatly low. Light is medium. Nothing has changed. It has been open and closed on and off for the last few days. But never fully fat and open. He looked really good when I fed him this morning.
Has flow, light or position changed?
If not, occasionally mine will close up for a day or so for seemingly no reason.
 

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