Cool idea. Don't have any jumpers and keep open top on 72 bow front. Did make tops from eggcrate material. Put them on at night or when away from the tank for awhile. Mine are more for cats not falling in, they lay on the light fixture that is suspended over tank, it's warm. Sometimes bird, Blue and Gold McCaw jumps on light. I'm more concerned with them falling in tank, not for cats or even bird can get out since she has jumped in every pond we used to have, We had 14 years ago, but the tank getting destroyed with them trying to get out. LOL