Oops, left . Sorry bout that. I think it will be fine. The decorations will block a smidge of the heat. Anything high up in that corner may get a bit too warm, but if you keep the decor a couple inches lower it should be fine. Misting also drops the tank a good 3 to 5 degrees for a short time depending on the temp of the misting water. The moist humidity will help average out the temp too. You could try a misting test. Spritz it down to 75 % and then recheck temps in about a half hour. Of course, the humidity will drop without your decor or substrate in there, but it should give you an idea of where the settings will linger.