Hm -- I worry when someone says "it might help ...". The fish in the wild get exposed to night air too -- so "it might help to carry the aquarium outside at night!".

Most plants would likely prefer a lower temperature than the fish, but again most seem just fine at the higher temperatures. Of course it might help ...

I would not be too concerned, your temperature will likely fluctuate a bit anyway so just don't worry about it too much.

Now if someone said "we did comparative tests and the plants in the tank that ..... did better than those in the ... tanks, and we repeated the experiment a number of times" -- THEN I would take a serious interest in it.

Otherwise, if things look good don't mess with them.