Not really, once in they will move to wherever they want. Mine was stationary for three years till for reasons unknown to me it up and moved and smothered one of my favourite chalices! It has been there ever since. Two years. It also depends on the type. Some live with the foot buried in sand, others locked in a crevice and others will climb to the top of the scape and sit in full flow. Look into where you would like it and sometimes that will dictate the variety you want and see how it goes I guess.