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substrate for looks only?

April 26, 2017looks Substrate

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substrate for looks only?

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Also, I’m changing the main filtration on my tank from a penguin BioWheel with ceramic noodles to a sump with bioballs. Most of the advice on your site says to use live rock and a deep sand bed instead of bioballs because of the nitrate factor. But I don’t have room for a deep sand bed, and as far as I know the penguin/noodle combo produces lots of nitrates too but I was able to keep my nitrates at zero by using a zeolite (I think) type medium that has the right size pores for anaerobic bacteria to live in.