I set up my phosban reactor last night and wanted some feedback. It states in the instructions to turn the water flow to where the top of the phosban layer is gently tumbeling. Well I am using a Via Aqua 400 and have the ball valve turned WAY down. My delimma is the whole top layer of the phosban is NOT tumbeling. It tends to be just one half of the top layer. Like if you were looking down on the reactor and looked at it as a circle, the top half of the circle would be mixing nicely...the bottom half isnt moving. does this make sense? I dont want to turn it up to high. Im running 150 grams.