Would A Magnesium Problem Cause This?

Empty Bottles

New member
I've restarted my tank. It cycled before Thanksgiving. I added an Orange Bam Bam frag on 1/18 that is doing ok. I've had a new polyp develop. On 2/8 I added a frag with Radioactive Dragon Eyes and Whammin Watermelons on it. The Dragon Eyes are open, but the Watermelons never have. I've had some partial open ones at times, but nothing fully open and not that many of them. Now some of the polyps have shriveled up and look like they are fixing to disconnect from the frag. I've moved it on two separate occasions this past week and left it there for three days with no improvement. I moved it again today with I noticed that it was looking worse. The dragon eye polyps opened immediately, but still nothing from the red ones. I'm no expert, more like intermediate skilled, but I am completely baffled by these zoas.

Parameters are:
temp 77
salinity 1.023
Alk 9
Cal 450
Phos .04
Nitrate 0

I didn't test magnesium since everything else was in line and there aren't any other corals in the tank. I'm assuming that it's where it should be. It's a Red Sea test kit, if you're familiar with them you know how much of a pain it can be to do that particular test. Now imagine that when you were installing your dosing pumps you had a few too many beers and threw away the test instructions and you have to watch a youtube video every time you test now.
 
My tank is about 6 months old and I'm still tweaking the dosing regime.

Mg levels got low a few weeks ago (~950-1000) and I've been gradually increasing it with MgCl2.

The temporary Mg excursion definitely seems to have affected my two zoa frags (polyps look smaller, less-coloured). Maybe it's coincidence...

G
 
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