You may find some of your plants need full sun. I would also hit home depot and pick up a sheet of rigged 2" styrofoam 4x8' it should be under the tank as well as the sides and top ( leave air gap at top). If it is too big to haul cut it up to size in their parking lot razor knife and straight edge.
I think the foam would be a great idea with the initial planning, but my plant are everywhere right now; after the replanting from deer strikes, and etc. Also the tomatoes are 2' tall.
I think I'll try the screen material on the hotest of days only.