Birdsnest Polyps Retracted

[tripnbili]

I have two mini colonies of pink birdsnest in my tank and they have done great with wonderful growth and PE until a couple of days ago. I noticed that the polyps were retracted. The thing is that both of these colonies were from the same frag, so they're genetically the same. They're on opposite sides of the tank, and no other SPS are affected. I have another pink birdsnest and a green one - both unaffected. My water flow is great. I run a ULNS via ZeoVit. Params listed below. I don't notice any signs of bleaching, STN, RTN, pests...etc The lights are off now, but will post pics when they come on.

This one baffles me...:sad2:

Temp: 79
dKh: 7
Ca: 440
PO4: .02
NO3: 0
pH: 8.3
sg: 1.025
K: 380
Mg: 1300

 

[Stuginski]

Hi Trip...

I had exactly same problem here 4 days ago! All my other corals with normal polyps extension...but my birdnest retracted all polyps for 3 days!!!! very unusual!!!!

Today the polyps of my birdnest are ok again....in my case the problem was caused by a swing in reef temperature some days ago (this is a hot summer here in Brazil).

Best regards.

D.