As for the screen... If you'd like a more permanent solution, you could buy a piece of plexiglass/acrylic from home depot or lowes and cut it to cover about 3/4 of the tank lid. They also sell special knives for the acrylic that you will want to use also. Makes it a lot easier.
I'm so relieved to hear that. It just gets confusing and a little worrisome hearing so many conflicting "ideal" temp ranges.