Is your tank covered with anything? These fish are known to become jumpers and I mean it by personal experience. Mine jumped out of a 3" x 3" open space from my tank. I saw him next morning laying on the floor in the back of the tank. Since then, I've tried to cover every inch of my tank since I have many jumpers in my tank.
Also, they tend to be shy and hide. Again, the one that I had went missing for about a week hiding in the rocks until I saw him again and then he jumped.