Hi Rich,
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Originally Posted by Bblinks
I was thinking about putting some marine pure biospheres in the tank since my rock work is very simplistic.
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The two products do somewhat different jobs. The Kaldnes is just for aerobic biological filtration while the biospheres apparently reduce nitrate anaerobically as well as the aerobic bio filtration.
The Kaldnes is the best option for biological filtration as it is the most efficient and then the nitrate/phosphate can be neutralized using vinegar/vodka. The advantage of the Kaldnes media bed is that it does not deplete the oxygen level in the water due to it being in a liquified bed.
I would save my money and go with the Kaldnes media.
Cheers,
Tim