Haven't heard of the corys "stinging" things, but the stuff about the fins very well might be true. I used to have corys but they died when my cat put his litter ridden paws in the tank and amonia killed them. Anyways, I have a featherfin cat fish (Curious george) and his dorsal fin and tail have rather large tips on them. I was cleaning out his tank and he got excited and accidentally jabbed me with it and it did a good job! Felt like a bee sting really. My rapheal catfish (mickey) does this too, but more agressively. Niether are really agressive since I can hand feed both of them.
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