In general they should not be exposed to air. Also they must be drip acclimated for a long time like 3 hours. They are very, very sensitive to changes in condition like salinity, PH, and temp. Also A 65 gallon is probably too small of a tank to house one successfully. Also it usually takes some time for them to start to show any signs of them dying. So dont think that its been a few days so it's fine. Sometime from not acclimating them properly it takes a few weeks or even a few months for them to die. Sorry for the grim news.