A couple of weeks ago I found a totally new air pump I had lying around and I decided to use it. However, I think that it is now broken due to water backflow. When I plug it in, I hear a silent vibrating noise inside (due to the motor?) but no air is coming out of the hole. The air pump that is connected to my sponge filter is still working fine but the one connected to my airstone is the one that is broken. I was thinking about buying a gang valve so I would only need one airpump. My question is does the use of a gang valve make the pressure of the air pump less? thanks.