[jamesbuf]

I already have a 24" tall, 4" diameter denitrator that I made a few years ago for my 75 gallon at the time. Now that I have a 180, I was looking to use this one instead of making a new one. It has 80 feet of tubing already inside, so I was hoping that I could just hook up another 80 feet of tubing on the outside (connected to the inflowto the denitrator) and increase the flow. By having 160 feet of tubing, I'm hoping to increase the flow and still have the water de-oxygenated by the time it hits the bioballs in the center of the pipe. My only concern is that the anaerobic bacteria will not have enough time to break down the nitrates. Having a 4" diameter, I was able to fit quite a few bioballs in there. I'm going to buy the tubing and try my experiment, and just make sure to keep track of the water quality that comes out.