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18 inches. You don't need more than 3-4" for the calm bottom zone and likewise for the top 2". The rest is the 6-8" for the mid-zone. I have another 6" to the top with a sensor 2" from the rim and the emergency overflow 1" from the rim.
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Failure isn't an option It's a requirement. 660g 380inwall+280smp/surge S/L/Soft/Maxima/RBTA/Clown/Chromis/Anthias/Tang/Mandarin/Jawfish/Goby/Wrasse/D'back. DIY 12' Skimmer ActuatedSurge ConcreteScape
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