like ryan says.
Make sure they ave areas away from light that are shaded.
Now in my tank because of the background i made it overhangs into the tank, and makes perfect secluded areas for them.
Or simply have plants that create shady areas on the surface.
Or you could use floating plastic plants and attach to the sides of the tank.
They should not jump but they will leap across the surface of the water once big enough.
Also make sure you don't have any surface fish under 1inch, as they will be seen as food plain and simple.