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As far as the sand bed goes, unless you are going to have sand sifting inverts, you can either lower the sand to 1" or so or increase to a DSB at 4" or more which will give greater filtration value. I agree with everything that anenomeman said otherwise. Bio balls are a nitrate factory, instead utilize small pieces of LR in the sump. Sounds like you have a good setup to begin with. Keep us posted and good luck.
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Anthony Eovaldi
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