Duncan corals

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My Duncan's keep closing for several days. I started with 6 heads and now have 12 . They're not huge but seem healthy most of the time. Any idea why they are closing up like this?
 

Jekyl

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Parameters? Lighting? Tank pic?
 
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reeferKen

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Mine close to closing doors, vibration, other times i never knew but a water change would bring them back out. I'd like to know too
 
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Jekyl

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The numbers may help. It's either your parameters, lighting, flow or pest.
 
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Lights are in night mode but this is it
16141296034058633899139308236774.jpg
 
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Jekyl

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How old is the tank? Have them in direct flow?
 
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I've been spot feeding them and they were opening and actually putting on new heads . They closed yesterday and today. A couple of the heads opened a little today
 
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vetteguy53081

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vetteguy53081

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These are fairly easy coral. First thing I see is location. On the sand does not do well as PAR is lower but mainly is that they get irritated easily if sand reaches them. I would elevate a little assuring it gets moderate light and water flow.
Additionally:


Temp 77-79
ph 8.1-8.3
salinity 1.025
nitrate < .04
Phosphate < .04
alk 8-9
Mag 1300
CA 440
 
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These are fairly easy coral. First thing I see is location. On the sand does not do well as PAR is lower but mainly is that they get irritated easily if sand reaches them. I would elevate a little assuring it gets moderate light and water flow.
Additionally:


Temp 77-79
ph 8.1-8.3
salinity 1.025
nitrate < .04
Phosphate < .04
alk 8-9
Mag 1300
CA 440
They are actually on a rock several inches above the sand my parameters are what you said except the mag is a little high.
 
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vetteguy53081

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They are actually on a rock several inches above the sand my parameters are what you said except the mag is a little high.
any little bugs on them upon inspection? Mine are super happy always and each head larger than a silver dollar

600g progress l.jpg
 
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