it's only i'd say like... an inch and 1/2 tall or so - it's planted at the bottom of the tank, but... *goes and checks on it* it's swaying more than it would be pumping, plus it's behind a rock wall so it's not really getting a whole hell of a lot of current but its still flowing which is odd but o well - i figured that it would be a cool looking addition to my tank for $30, right?