I was having problem with my hang on back overflow box making a lot of noise. I read the thread here on durso's etc and was planning on modififying the drain tube to a durso or some variant of that. In the meantime I decided to try just feeding an airline tubing down the drain tube. I inserted maybe a couple feet of airline tubing and left maybe 6 inches above the drain tube. It really has quited things down. Are there any problems with this?