I find the whispers, even a brand new one, will rattle my bones they are so noisy. Instead I use a Rena when I want a quiet pump. The model depends on how much air you feel that you want. Rena will even tell you how many typical air stones each pump will run at particular depths which is quite handy. Because the air flow is adjustable over a wide range with them, I like to go a bit bigger than I expect to need. Any pump is noisier if it is being pushed to the limit.
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