Hey guys I need help. What have people used for flow in a large tank? I'm not happy with the vortechs I used on my 4ft tank and an intersted in what others think are viable options. If I have to go back to the votech's i will as i have a MP10 and an MP40 but hoping to find something else. Hubby (a computer programmer) is building a rasberry PI controller for the tank so want something he can plug into the controller and adjust if possible. (i have no idea if this can be done, and hes busy with work for a bit so cant tell me either) Please help