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How big a sump?

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I think the absolute minimum you want is 10% of the total tank volume.

Bigger the better I think.

On my blue dolphin tanks I have 3 4x2x2 tanks and a 4x2x2 sump running them

But that's just my opinion.

The only sumps I have had was a 300litre that sat under a metre cube and a couple of 3 footers that were attached to racks with 2foot cubes

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