zoos closing up

[dive1]

I have a shell which has several different colored zoos on it and had been in the reef in the same spot for several months. Today I noticed that only about 10% opened up. Other zoos in the tank look ok...Is this normal ? water test look good.

 

[beth]

It could be that something around it is bothering it. Any other corals around them? Are there any fish/inverts picking at it?
You might try moving them to another location and see what happens.

 

[nm reef]

Is this normal ? water test look good.
Post recent results of water tests...my zoos often respond poorly whenever my alk or ph get out of line. A simple problem in your water chemistry may be the cause.

 

[dive1]

temp 81
alk 13.4 dkh 4.80meg/l
cal 490ppm
ph 8.18
gravity 1.026
Everything else is 0 (nit, phos, ect)
These are normal readings for my tank..there are no changes from recent readings.

 

[overanalyzer]

mine close up when my shrimp scamper over them. Also - have you added zoo's recently?? you might try a brief fresh water dip to see if there is something nibbling on them ....