I've got a few new fish from the LFS today and a few hours after I brought them home, one died. All other are fine and all my water tests are good. Real question is: I've got to take the dead fish back to the LFS tomorrow with a sample of water from the tank. I'm leaving the tank overnight and won't be able to come back until after I go to the LFS. Can i take a sample of water with me tonight and to the LFS tomorrow and it still be accurate?