Quote:
Originally Posted by brisco
It seems that is the idea with the Hydroton and biopellets just build on that idea but give the bacteria a food source as well.
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Actually wet/dry is purely for aerobic bacteria (ammonia & nitrite consuming) whereas Hydroton also provides an anaerobic environment inside the porous clay balls for nitrate consuming anaerobic bacteria. Wet/dry systems worked for fish only tanks but were nitrate factories so bad for reef tanks.