It's stated 6-8 inchs in the instructions. I had mine at around 8 and it's in my ato area so the water level was always constant. It was a little tricky to set up but there is a break in period to don't forget.
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206 gal tunze centre overflow star fire front illumina 260
Loudest part of my system would be the nagging sound I hear on a regular basis about how much time and money I spend on the tank.
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