Eh? A bored fish will obviously enjoy the mental stimulation of finding its own food. It's what they do in zoos etc. a predator will similarly enjoy the catching of its own food as it's what they are hardwired to do. It more natural to them
They certainly look it...good color and body size with no apparent health issues.It's not like I'm giving them steroids.Growing faster doesn't mean they are healthier.
Great point,and one that I have noticed when minnows are used as feeders.if going the route of feeders, I'd say danios are a poor choice; they are very energetic for a reason, that is to increase their chances of avoiding predation.
Sure, the JD will probably catch them; but he'll expend much more energy catching them, than he would catching guppies for example.