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This is kind of a trick question. A fish tank has a large thermal mass. If it started the day at 84 instead of 78 how high would it go then.
This is very true. I get nervous when my tank temp hits 81 but I added a fan on the sump to kick on at 79.9 and now my system stays between 78.9 and 80.0 so about a one degree difference. However since doing that I've had to increase my top off water from a 5 gallon bucket a week to a spare 20 gallon tank that I modded for top offIf temps cant be lowered then consistently is best. Fast swings are bad however high temps lower disovled oxygen and can cause corals to bleach. Add a fan over the tank or sump will lower temps. It doew increase evaporation so be sure to up on top off.