Elgin - you bring up a good point. It was pretty scary standing behind the player station with a tower of tetra looming over us ready to drop #18. It is definately a concern and something that we (and others) will have to be very careful about.
What I am more concerned with is capping on the far end of the field where depth perception may be off. The drivers will definately need to be careful when performing such maneuvers.
I guess the good thing is that the tetras (at least ours) seem to nest pretty well. It may not be a perfect nest, but it usually doesn't fall unless provoked. I think
this picture is a good example of that.