Originally Posted by Brizo
It has 2 outlets but I made a line so that they both can feed too one line. I think I may use that or one airstone 2 seems like too much
Well if you go back to the two lines, feed them into the 4gang valve, one line each end. Then if you need to reduce the power going to the airstone, simply open one of the valves that is not being used. Like a pressure release, this way the pump is not being restricted. Hope this makes sense and is just an option you could look at. Worked for me at the time....