Hi,
76 to 79 is a good temp range. I keep my tank at 77. It is best to try to minimize temp swings as they can trigger an ick outbreak, especially if you have added a new fish recently and not quarantined it. IMO the key to a successful reef tank is stability in all the parameters.
I mix all my water for 24hrs and heat it when dissolving the salt mix. Be sure to roll the bucket around to thoroughly mix the salts inside it before using it.
As for the DT dropping temp when the heater was moved to the sump. I suspect the return pump is not strong enough.
Cheers,
Tim
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