Has anyone built these for your reef tanks. I currently have a small drain in my overflow, and the overflow is filled with bioballs. I put the bioballs in there to quiet the noise down. I have now got hair algae and think this may be one of the reasons. Nitrates from the bioballs? I was going to buy an allglass durso pipe, but they want $50 bucks a pop. I dont need the return, just the durso drain. Some people have built there own I am sure. Any ideas, and are these still quiet? Any help would be greatly appreciated. Thanks.