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bio balls

  1. Jasonshine

    Bio balls necessary in a biocube 29?

    I have been slowly changing the filtration in my biocube 29 (Coralife) - it is almost a year old and lately I've have had issues keeping the nitrates down - the rest of the water parameters are perfect. I have about 30lbs of live rock and 10lbs of live sand - do I still need the bio balls? A...
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