I put a 5 gal rdsb with 60 lbs HD white playsand on my overstocked 120 about 3 months ago..
I have 24 fish, 10 sps, 5 lps, lots of zoas and 'shrooms and a large gorg.
I also overfeed.
I have a 25g sump full of LR and a 10g refugium with chaeto.
My nitrates were below 10 before the rdsb and are now unreadable on a salifert test kit.
The sps are growing noticeably
Worked for me
Your mileage may vary.
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