I acclimated them perfectly,
I didn't compare the store's water, but I had bought the Amano shrimp from a tank that uses the same central filtration as the guppy tank at the LFS.
I found the other female dead, which leaves only 1 more male from petsmart, and a male I had bought from petsmart about 3 weeks ago.
I acclimated the guppies perfect too, doing a float for 5 minutes, putting in a cup of tank water and wait another 5 minutes, doing the previous 2 more times, and finally releasing the guppies.
I didn't compare the store's water, but I had bought the Amano shrimp from a tank that uses the same central filtration as the guppy tank at the LFS.
I found the other female dead, which leaves only 1 more male from petsmart, and a male I had bought from petsmart about 3 weeks ago.