echo from air vent Todd, I have read through your threads and liked what I saw as I have a 55 gallon non drilled tank. I just got into the hobby a few months ago and have spent far more than planned so doing this as opposed to purchasing a different overflow that didn't suck was good for my wife and my wallet lol. anyway I have taken your design and built the same / very similar design for my tank and there is a lot of echo from the air vent pipe. I know you said this was a quiet system (one of the reasons i chose it) but right now it is not quiet lol. Just wondering if you could point me in the right direction for trouble shooting? I will try to post a picture today or tomorrow of my setup.