Emergency:shrimps are frantic now!!!sos sos sos

I bought 10 pieces of green shrimps,(not the green cherry ones)last evening. i acclimatised them to my tank over 2 hours(which is my usual practise)... however, upon introduction into the tank, the shrimps started swimming frantically and curiously, their greenish colour took on a red-orangey hue @ the upper half of their bodies.
I expected to see them dead this morning, but they weren't... still swimming frantically as ever.(By the way, 5 of them are berried!!!)
What's wrong? My other shrimps are fine, (10bds,6sakuras,12crs and 80odd sakura shrimplets)
Please help!! thanks!