Robot Fish
I really want to like them (being a reef geek & tech head) but somehow it's not that appealing.
Maybe they should have made it nicer looking, or either more futuristic or more natural looking. At the moment it looks like one of a crappy plastic fish that people of dubious taste may put on their mantle piece.
In any case there's no substitute for the beauty of the real thing that we have in our tanks.
.