Quick Zoa help question
 

Calling all zoa freaks,

Hoping someone can help or got another idea, Recently my fire and ice colony of Zoas has closed up and been closed up for about 10ish days now trying to figure out why and see if i can get them back before they melt away like so many do.
Nothing has changed in the tank, still doing weekly or bi weekly w/c, parameters are in check
phosphate - .08 on the hanna
calc-420
alk-7.5
mag-1380
nitrates- undetectable

All the other Zoas close are open and fine the fire and ice ones randomly are closed ? not sure why? I tried moving them up to the close rock ledge thinking maybe a little less light and flow would help but I'm running outa ideas

Any thoughts?

Few pics

Current state
http://i1304.photobucket.com/albums/...ps0762959e.jpg

Placement before ( all other zoas fine)
http://i1304.photobucket.com/albums/...psdb8041b4.jpg

2ish weeks ago same frag
http://i1304.photobucket.com/albums/...ps6014e626.jpg

Have you added anything to the tank lately ?

how long have they been closed?
sometimes mine close randomly for a couple days and then come back to normal on their own
I find large changes in temp. will also make them close for a couple days

Haven't added anything new to the tank, they have been closed up for 10 ish days now i think i didn't start to worry until after like day 5 cause yea I've had some close for no reason for a bit then open but I'm worried now they won't open again

Only thing I can think of went away for a week and brother watched my tank and i forgot to add kalk back into to my ATO and my ALk was down to 7.5ish when its usually over 8 but I can't imagine a point or so dkh drop over maybe 2 weeks being the problem when everything else looks good

Ok thanks for the help guys, yea I've been looking doesn't look like any pests on it and it doesn't look like it started melting yet but I may dip it quick and put it back were it was ( happy before) and cross my fingers

Update well after the dip and moving back colony has came around I was pretty sure i was gonna lose the whole thing for a bit there now it looks almost better than before
thanks for the help


http://i1304.photobucket.com/albums/...psd8ef314e.jpg