"keep in mind though i do run Rowaphos, which some have considered to remove the Aluminum..."
Rowa do a great job, but i still don't believe those blocks remove Nitrates, in my opinion Bio-Pellets , Macro Algae , Sulfur filter remove 100 times Nitrate then those blocks. Is about how you balance the Carbon source and close loop filter , density of Bacteria, you may have 500 lb. live Rocks and one good filter bet those , to remove Nitrate.
Rowa do a great job, but i still don't believe those blocks remove Nitrates, in my opinion Bio-Pellets , Macro Algae , Sulfur filter remove 100 times Nitrate then those blocks. Is about how you balance the Carbon source and close loop filter , density of Bacteria, you may have 500 lb. live Rocks and one good filter bet those , to remove Nitrate.