My tank layout is all glosso and rocks and no-surface cover at all and my Yamatos don't jump. So I think shrimps jump mainly due to lousy water...spituch said:One thing I've noticed is that with extremely dense planting, especially at the water surface, fish that tend to be jumpers don't do it as often. I think fish (or shrimp) that feel threatened jump, but if they see that the surface is restricted and there is favorable cover nearby, they go for the protection of the plants. I think simply having the protection of the plants puts fish at ease, reduces their stress levels, and then they hardly jump.
In your case, if they are jumping from the rear of the tank, can you put more (higher plants) in that area?