They are tiny, very tiny. Of course he's talking about measurements, so if you really LOOK at the ruler you're good to go :) I didn't do that. Although they are still great. I use two in a heavily stocked 10g tank (and no HOB filter). I use one of these, plus a larger one, in another 10G tank with a few guppies and (usually) neriti snails. No complaints here, just wish the foam was a little denser.
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