I have had this tank up since Oct 07. I see no large build up of detritus in the bioballs section. Having said that this tank is run with fish and corals. This tank also has 40lb of LR and a deep sand bed. Nitrates are taken up by the caulerpa in the tank, not in the fuge. I just do a little harvesting when it starts to over grow. The fuge tank needs more light but what it needs more is better internal circulation. To date I have had zero problems.
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