This is my second skimmer and this time I wanted to try a Becket injector. I put it together differrent than all I have ever seen. I shot the water/air straight into and up a 6" dia. tube, reduced to 4" then a 4" to 2" adaptor and about 3" of 2" into a collection cup. Because I want to fit this under the stand the hole thing is 28" tall. I really could go bigger. The strangest thing is the water level is soo dependent on how much air you allow the injector. At first I used a Quiet One 4000. The backpressure killed the action. Now I'm useing a Dolphen 1200. It took 36 hours to get the adjustments right and a noise I can live with. At the end some of the coral really wheren't open and I even changed 10g of water. Hopefully they will be OK. Now it's going Like crazy and it's time for another beer.