I work for a chain pet store and we don't and won't carry dyed fish for the exact purpose that it isn't natural and is deadly. True most chains are not great places to buy fish only for the real reason most of the fish are hooked to one big system. That part I don't appprove of. Mainly because when you have one sick tank there is a high possibility all tanks can get it, but we have plugs to cut those tanks off from the main system. But its a job and I love animals and fish.