when you have no liverock and no sand, where do the bacterias settle?
My guess is there will be very little bacterias present to do the filtration. Also one good thing about porous liverock is that it will do a good amount of anaerobic filtration thus getting rid of a lot of nitrates as well.
How can one do a fish only aquarium without this as filtration? you will need to do lots of water change probably and monitor ammonia and nitrites and add something like Prime or AmQual to remove it.
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