Consider adding carbon to your filtration for the smell. Putting saran wrap over the tank wouldn't work as it would seal your tank from oxygen and it would slowly die.
As for the water changes, mix it up in another bucket, and drop in a heater to get the temp close to your tank. The idea is to minimize temp shock to the organisms, not to help the salt dissolve. And mixing brands is just fine
As for the water changes, mix it up in another bucket, and drop in a heater to get the temp close to your tank. The idea is to minimize temp shock to the organisms, not to help the salt dissolve. And mixing brands is just fine