I would say, for the most part, that's true. I don't think small or slow swimming fish would have a chance with a big tube nem. I've seen a fish, or two, (my mandarins, and wrasses) get caught by their tentacles but easily break free...don't know if a pipefish would have the strength though...Thanks! I was thinking about getting one but I heard the care is difficult and they have the potential to eat small, slow moving fish like my planned pipefish and coral crouchers. Is this true?