What material is your bio ball made of? If it is made of plastic, it is useless! The uncle at Lam Hong Aquarium told me that plastic does not trap bacteria, hence it will not help you in growing beneficial bacteria.Originally Posted by krabbie
Bio ring is worth the $ if it is made of ceramic or something that is porous like those offered by Ehiem.
I recommend you to use Biohome if you are interested in growing beneficial bacteria to break down your NO2
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