I picked up a couple of K4s when I got my LR yesterday. I got to tell you all I'm a little disapointed in their flow. I was expecting to get more than what I'm seeing. I was concidering getting 4 K4s and a controller for flow in my 225... Boy that would have been a waste of 800 bucks. I guess for 30 a piece they will do what I need them too but I will need at least 2 more of them. BTW, I'm not going to use them for flow in my tank.