I agree with Gonefishin. The only way it can be care-free is if you hire someone to do all the work for you, especially the initial work to cycle it and weekly water changes. Good thing money's no object.
Since a 3-year old can't be expected to take care of it, get a toy of some sort or maybe a fishy video.
Since a 3-year old can't be expected to take care of it, get a toy of some sort or maybe a fishy video.