I originally thought that would be a good idea to help retrain their eye muscles back into shape- but a couple of things stopped me, the first was the fact that the really bad DE cases couldnt even see floating pellets, so to make it that much more difficult on them wouldve led to missed meals and in turn rising aggression- the next reason was they might get too comfortable with jumping- the walls above the water line are no higher than 10", thats nothing for a 2' or 3' aro to clear- with the amount of bugs over the pond, they would be tempted to take a leap of faith, and might not land back in the pond