one of mine has actually starting eating for the top of the tank. After he gets all the "easy to get" pellets from the bottom, he shoots up to the top to get the ones that are floating.
Thanks for the comments all. I have two 8" Sens in this tank and from the moment I put the Black in they have been swimming up there with it most of the time. I was halfway affraid they would annoy it so much it would take one out but so far it has been a peaceful affair.