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Let's use a little common sense here... sure if you have a 400g system, and rDSB that is the size of a large cottage cheese container isn't going to cut it ( hey it's still 5" deep!). A 5 gallon bucket will keep the majority of systems low in NO3, unless you're talking 1000gals or something....For 100-300g probably....
They take time to develop the bacteria cultures too, so it won't be overnight that your running low NO3s.
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