If you want to truely tumble it, you will have to have a good sized cube, with nothing in it but the cheato. This way it dosn't get caught up in anything. I used an external pump plumbed into pvc returns with small holes drilled in it. I put one at the top of the aquarium and one on the other side on the bottom to create the rotational flow. Worked really well. But its a lot of work, and more suited to a remote fuge setup. If this is just in your sump with egg crate walls don't bother trying to tumble it.
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