I watched a thing on discovery channel the other weekend on the largest aquarium in Europe. In it they took this thing that kind of looked like a water jug, stuck fish in it, and threw it into the beluga whale tank. The beluga's knocked the jug around until the fish came out and ate it.
Working on a more simplistic approach. I took the lid from one of my no longer in use DIY CO2 bottles. Filled it half full of pellets and placed it floating on top of the water in my tank. The JD cautiosly swam around it the started nudging it around the tank until it finally tipped over. It was funny to watch. Especially when it dumped all the food out and the featherfins actually came out to get some of the food that was in the water column rather then waiting for me to drop disc into them later.
Working on a more simplistic approach. I took the lid from one of my no longer in use DIY CO2 bottles. Filled it half full of pellets and placed it floating on top of the water in my tank. The JD cautiosly swam around it the started nudging it around the tank until it finally tipped over. It was funny to watch. Especially when it dumped all the food out and the featherfins actually came out to get some of the food that was in the water column rather then waiting for me to drop disc into them later.