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You will want a depth of 10-20 cm, I would target approx 15cm but the lower you get it the higher speed you will be able to run on the pump which will give more aeration and benefit the pH.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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