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In my opinion, the best thing for you to do is STOP. Take a second. Stop killing fish. Do some research on your tank and intended livestock.
Powder Brown's (japonicus) are extremely sensitive fish (not to mention wholly inappropriate for a 40gal tank). The combination of putting him in a new tank with freshly mixed saltwater, and then bouncing the temp on him is no doubt what did him in.
You said you checked your water today and nothing was wrong. What did you check for? What were the values? Did you check ammonia and nitrates? What about salinity? Was the salinity of the water in the display the same as the salinity in the QT? What are you using to measure the salinity? If you aren't using a refractometer, your measurements could be way off due to the different water temps.
How long did you have the Powder Brown before it died? How long did you QT him for?
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