New Zoas Opening?

have a quick question on Zoas.  I just purchased some small frags of green and pink zoas last Thursday.  Acclimated them to the tank and they seem to only half open up.  When picking them out at the LFS they were fully opened and bright, in my tank they seem to only barely show their true potential.  Been in the tank a few days now and was wondering if this is a normal thing that may happen, taking awhile to fully open.
Currently the tank parameters are normal, checked all tests twice.  The lighting is however a little stronger in my tank as I have 2 150W MH along with some PCs (In a 65 gal), and the original tank had just a couple PCs.  Have 2 modded Maxi Jet 900s blowing around the tank along with sump return for flow.  My clam and other mushrooms have been flourishing in the tank for months.  Also the clown pair and Fire Shrimp I picked up along with the corals are having a great time.