I have been housing preds for 15yrs now and i can tell you from experience that any true predator will not eat a really sick feeder. A scavenger will eat a sick feeder in a heart beat. And they will eat dead feeders as well. A predator will never touch a dead feeder with out alot of starvation or other tricks. So I just wanted to separate those out. Alot of people think fish are preds just because they will eat live foods,when they are scavengers. ------------------------------------------------------------------------------------------------------------------------But back to your original statement. i think it is very cruel to train a fish to eat what is not natural to it. i would not starve my dog to try to get it to eat dirt. Nor would i starve a kid to try to get them to eat worms. And if someone did this they would be breaking several federal laws here in the US. But fish have no laws protecting them, so people can starve them and do all sorts of cruel things and think it is perfectly OK to so. All it takes is a responsible fish keeper to quarantine and cull feeders to get them Ok for feeding. Alot of fish keepers are to lazy for this so they starve there fish onto a easier food source and make there predators into something they were never meant to be. It irks me to no end to see a person house a big toothy predator and make them eat pellets.