That many animals do not die that close together in time frame due to disease, especially after being acclimated. The only thing that will kill that many fish that quickly is something environmental. With the volume of water in that exhibit i find it very unlikely that something accientally put into the systems via someones hands caused the death. The zoo PR is lying, it either was an equipment failure of some sort, or something wrong with the water that could be tested for whether that be salinity, ammonia, nitrate, or nitrite.
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