First Zoa's Not Opening up

[Luke Schnabel]

I recently bought my first Zoa Frags form my LFS three days ago. The one frag opens up slightly and the other is barely opening.
Tank Currently Temp 77-78, PH 8.12, Cal 365, Alk 9.2, Mg 1400, Amm 0, Nitrite 0, Nitrate 20, Phos Unkown(no test kit yet)
Temp Fluctuates every 5hrs controlled by Apex. Cal has been 390 for the last two weeks but noticed today when i did my test the tube is above the Cal fluid level so it was drawling air. Alk for the past two weeks has been between 9.0 and 10.3, Mg has been between 1420-1360 the last two weeks.
I have two MP40's running at 60%. The Zoas are in moderate to lower flow on a frag rack. I have them under a AI Hydra 26 running on Coral Acclamation mode at 50%. Also, I bought the week before a small piece of green star polyps. They open up all the way and have even grown three new polyps.
Im confused as to why the Zoas are not coming out???

 

[rogersb]

Might be the difference in parameters from the store to your tank. Your alk is probably fine but might be a little higher than a store. I keep mine between 7-8, and so might they. Your calcium is low. Bring it up to 400 and see if that helps. Mine was recently around 360 and a lot of my zoas would not open. It's up to 390 and they are doing much better. I'm going to get it over 400 today to about 410. I would try shooting for that in your tank too.