Just putting my experience out there for other newbies...
I had 9 gallons of bioballs as a part of my sump for the firsts 4 months of my tank being set up. My nitrates weren't bad...but I couldn't get them below 5-10 ppm. I removed the bioballs 2 weeks ago and tested my water the other day....not even a trace of ntirates left. I guess there's validity in the notion that bioballs are nitrate factories.



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