Okay, bag some water to test at the lfs when they open.
Check his gills for ANY movement! He could still be alive.
Think about rather or not anything has changed. Have you used and airfreshener, bug spray, flee and tick powder, or any kind of chemical in the same room as the tank or on something that could have gotten it to the tank.
Did you clean the tank after the other died? What did he die with? Did you buy them at the same place?
Is there any salt-liske specks on his body or white on his gills or mouth?
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Last edited by Bluewind; 01-16-2013 at 08:37 PM.