wallda they are, and you probably are best off not to mess with them, unless you know what you are doing, exactly, there is a lot of real good info on the net if you want o look at them closer, i can even provide some if you''d like, but personally the only dealings i want with one are readings, maybe someday, if i can afford a heavy acrylic aquarium, just for some i may try, but until then, i just don't want one in my main tank
as far as their abilities, according to usa today one had smashed a public aquarium(i think it was in oxford, it's been a lon time since i read it)
oh yeah, i think it is really neat that someone is willing to take care of them for you(in the event you got one), most people, i'd only make suggestion myself