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What was in your gravel that kept NO3 levels high? If it did and you follow the estimative index that seems to me like it would be good. As long as all parameters were in check. You can do a RFUG which Tom has used and said they work fine. Although unnecessary it would do the same thing and offer good overall circulation. Use a lot of gravel with it and dont worry about things. Just dont use jobes :).
 
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