Thank you! The inout is not silent, but overall it's not that noisy. If you are very picky on having a quiet setup, I'd opt for another overflow. It's nice because it takes up very little space in the tank. The overflow and the tank were actually given to me by a friend. If this was not the case, I probably would've went with another design.I love this tank! So simple yet with great visual impact. How do you like the XAqua Inout? Is it quiet? I've been considering one for my next build.