Why did zoas stop opening in my tank?

Hello, I have zoas palys a mushroom and some other things that are all healthy and fine but my zoas stopped opening all the way. I added two more zoas and after a few days they also stopped opening all the way. Is there something that could only effect zoas?

Here is the water

Mg: 1335
Ca: 400
KH: 6.5
Ph: 8.2
Temp: 79-80
Salinity is fine

Here are some pictures, note the other corals in the background that look normal. This has been going on for a few months now.

http://i.imgur.com/1i3LQyx.jpg

http://i.imgur.com/rq2sveM.jpg

http://i.imgur.com/18vdHSz.jpg

YOur dKh seems very low? NSW=~8.0 This is lower than the last time you asked, if I recall correctly.

Also, sometimes you just need to change the water, and then leave it alone. Too much fretting and cleaning, and water changing, the poor corals never get a day to relax without a new change/challenge that they have to adapt too.

Drinkabeer and relax sometimes.

Also make sure you always dip prior to adding new frags

I agree you alk seems low and may be lower than your testing depending on what kit and how old and error in testing I feel shooting for 9 leaves you with margin for error both ways. I would raise it over the next few weeks slowly if I was you and then go from there just to eliminate that possibility


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