The drip for two hours is what most likely killed them. Ammonia built up in their water. Ammonia concentration in a sealed bag won't kill a fish, but once that water is exposed to fresh air, becomes toxic real quick.
If they were all together in one bag, then released into a bucket with the same water as the bag, then slow dripped for two hours, bingo! Dead fish, ammonia toxicity.
I purchased some aqua-cultured clowns recently from Coral Reef TN and the packing instructions say their 10 day live guarantee was ONLY good if I did a 15 minute float then release. In the past, I've always done semi-long acclimation to account for salinity and water differences. The packing notes stated they found the longer acclimation more stressful that salinity differences. I never would have done a float and release had they not strongly recommended it.




