DSB

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ok,
as in my sig, i have 13 lbs of live rock. i m going to add some 20 lbs of live rock to my aquarium in a few days. Will this help reduce my nitrates? If not , what else can i do, as i have cyano rampaging in my tank.
 
The more LR the better. You should really shoot for about 60lbs total for the best biological filtration. A 4in sand bed will help with NO3 accumulation but will really do nothing to reduce exsisting levels. To get the true denitrafying benefits of a DSB it should be 6-8inches in depth. For now, continue doing PWC with a high quality RO/DI water and reduce feedings. Take a look at your stocking level as well.
 
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