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I always thought you wanted the lack of O2. I also keep reading that RDSB's should be 6-8" deep. If you have it designed to be removable then I say go for it. If it doesnt work then dump it in the yard and let your kid play in it. I think that you will have exports from different things adding to zero nitrates. Fuge, chaeto, rdsb. One may not do it all, but all 3 might.
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