I think it is cruel to the fish because the duckling is clearly far too big for it to swallow. It was having difficulty and could have possibly choked, or worse. I feel this way about any large live animal being used as feeders. What if a large rat or in this case duckling cut through the throat of the fish with it's sharp claws? In the wild this does happen, but that is natures way. A large tank in someone's living room is not the wild, and therefore, a forced man made circumstance that is putting the fish at risk. We have a responsibility the second we move an animal out of the wild, to care for it in a safe and humane way. Plus, there are plenty of healthy alternatives to live animals that would be more beneficial to the fish.

lol XD
lets hope for that to not happen
LOL you must look fit as you are a MOD of the best of this forum!
lol XD
Thats funny, I don't care who you are thats funny