anyone has DSB in there

5" DSB in the main tank, 4" DSB in the refugium
Nitrates range from 0 - 10 ppm, the upper part of that range started recently due to an overfeeding of phyotplankton. Prior to the phytoplankton overfeedings, nitrates were consistantly 0 - 5 ppm.
 
I have about 4" in the main tank and about 5" in the fuge, with 0 nitrates. I also have a ball of chaeto in the fuge and C. prolifera all over my main tank, so hard to tell whats really keeping them low.
 
5-6" in main tank & 2" in fuge (looking for more sand), along with a ton of rubble & cheato. Nitrates around .5.
 
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