Pocillopora with "bubbles" please help

[Panta rhei]

Any idea? Right now I moved from top of the rock work to the sand bed, this seems to only have slowed down a bit the bubbles appearing

http://img.tapatalk.com/d/14/02/08/uze6uqa8.jpg

http://img.tapatalk.com/d/14/02/08/8uty4a4e.jpg

http://img.tapatalk.com/d/14/02/08/atezunah.jpg

[tripdad]

Check your calcium and mag. levels.

[Panta rhei]

2 days ago I had alk 6.5 dkh, ca 425, mg 1500

[tripdad]

Check them today to make sure. Are you running zeovit or anything similar? If not I would raise the alk to 7.5 SLOWLY. Others look fine, you could drop mag a little but not a huge problem.

[Panta rhei]

No zeovit, dsb + pellet reactor.
I'm out for 3 days now, will check the values asap.
In the last 2 days I tried to raise the alk with a proper kh buffer dosing (my goal was 1dkh per day) but it did not move from 6.5

[a.browning]

These bubbles tend to stem from high calcium in my experience. May be worth a second check on the Ca reading. High mag and salinity can do this too. I'm sure it can be other things but this is generally what I see being the case.

[Panta rhei]

http://img.tapatalk.com/d/14/02/22/ape3a3e4.jpg

Slowly getting worse, any suggestion? Dip into something?

Values are 7.5dKh, 430Ca, 1400Mg

[tanked37]

That's weird. I've never seen that, but yes, always dip into something and that something should be Bayer advanced insecticide. Cheap and very effective and will not harm that coral. I just dipped that exact coral in it last week. Looks great.

[smtank]

Boy that looks a lot like a green Stylophora.

[Panta rhei]

Comparing to other pics on the web, yes it looks like Stylophora. I've other two Stylos, a pink and a purple, thriving at the top of the rockwork.
This one was at the top too, I tried to move to the bottom to see if the problem was light related but light seems not to be the cause.
Bayer dipping is not for parasites?
I can not spot any parasites, at least by bare eye.

[Panta rhei]

An update after one month, hope this helps others.

A strange thing I noticed a couple of weeks before the first bubbles apperared was the skimmer overfoaming and overflowing for some hours after a water change.
This continued for other 4-5 water changes, until I checked the freshly prepared salt water and I found Mag to be out of scale!!
In the meanwhile, Mag in DT was 1,800.
I then mixed many many times the powder in the bucket, made again the salt water and the Mag was 1500 as it shoud be with that salt.
So my clue is I had a "layer of Mag" in the salt bucket that caused a spike in Mag over a few water changes, and for whatever reason only the green stylophora had been stressed.

The lesson learned is to mix many times the whole bucket powder content prior to using it.