cleaner shrimp problem?

[fishguy29]

Hi there. I bought 2 cleaner shrimp 2 days ago and one died today and i can't figure out why. The other one is still alive but is upside down on my live rock and just keeps moving on the one piece of live rock. I acclimated them for 1.5 hours slowly was that enough or no? is there anything i should do with the one that i still have to help him or just wait and see. also, the salinty was the same in my tank as it was in the store. my water is as follow

ammonia - 0
nitrites - 0.1
nitrates - < 5
ph - 8.3
calcium - 420
78 temp
alkalinty - 11.5

Thanks
Chris