Josh (Yauger) had a mantis in a refugium/sump that was very viewable. Not sure if he has pics of when it was set up, but it was cool.. I agree, I wouldn't put it in my display, but a dedicated tank for it would be nice. That tank could also serve as coral observation tank, or whatever makes you feel better about having another tank. Its very strange how they show no interest in fish. My cardinal was staying at robs for a while and would sit right out in front and nothing would ever happen. I watch Robs group of files swim right in front and again nothing.. Very smart little creatures to. I would definitely own one some day,.