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In the day oncology unit I visit frequently there is a lovely large fish tank. I have no idea what type of fish are in it, some tiny, some large. There is a tetra air pump sitting on top of it and it is silent - the quietest one I "have ever heard". One time I was sitting there and it was noisy, but I noticed it had crept and was about to fall off the back of the top (of the tank). I moved it forward a little and it was silent. So much so that someone said to me that I should not have turned it off! I don't know much about these pumps as far as reliability goes, but they are very very quiet.