Help, pink zoo's not opening after 2 weeks

[lvreefer]

Hey guys and gals,

I bought a nice rock of zoo's (about 6"x8") containing half gold and half pink. All of the gold zoo's are open but most of my pink are closed. I have had the colony for about 2 weeks now. They are about half way up the tank (12" from light) and under 108w PC's. The mixture of PC is 36w of actinic and 72w of 50/50. All of the bulbs are Realux and less than 3 weeks old. I do not add anything to the water except for B-Ionic when calcium is low. Water changes are done weekly at about 10% - 15% along with daily top off. Temp is from 78 - 79 degrees.

So what's up with these pink zoo's? Should I give them a dip? If so, plain water or with iodine. Should I move them lower / Higher?

Thanks for the help!