I have 2 Stream 6055 power heads connected to a 7094 controller, one of the heads stopped working so i was playing around and unplugged the cord from the power supply. When i did the one not working started, so both are running off of one supply. I believe these supplies power the controller which powers the heads, correct? So, is it bad to run both heads off of one power supply? Is the flow downgraded by doing this?