I put all fish/inverts into a container and use a small tubing with a flow restrictor to slowly drip the fish. I set it at about 2-4 drips per second and let that container overflow into a container that has a heater to maintain temp in a water bath. I started this procedure after losing a shrimp due to acclimating him by adding small amounts of water to the bag at a time. Well, that's what I attributed it to, as nothing else seemed to be going on that could have caused it.