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As stated above, and additionally, it depends really on whether or not you employ a RDSB or RDSB refugium to assist in export. Most bb enthusiasts will suggest at least 3 times the total tank volume, as far as the rating on the skimmer. Most of the successful ones usually devote this piece of equipment as their largest investment. I used a recirculating, mesh modded, out of sump skimmer on my 28 gallon bb tank that was rated for a heavily stocked 135 gallon tank(Euro-reef cs6-3), and had no detectable readings. That same skimmer had a hard time keeping nitrates below 10ppm on my old 75 gallon bb setup. I had to eventually add a RDSB fuge with a 5" sand bed in a 20 gallon tank, then watched nitrates reduce to undetectable. I am not familiar with the skimmer, but would have a back up plan just in case.... Good luck!
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