Yes, I wouldn't dare trying to move it purposely. I was contemplating adding a blue Haddoni and was worried that if the two got in contact that it may make my Red H. withdraw. As it is, it is around 16" fully expanded. I just love the contrast of blue and red so I just might go for it. I'll post pics if I get it this weekend. Ultimately, I will set up a species only tank with a rainbow of Haddonis (greens, purple, blue and red).