I guess I can see where you're coming from on the "you've got to be kidding
"
It depends on the size tank I guess, live rock and sand in many of our smaller tanks is actually cheaper than throwing a real nice skimmer on them, but that also depends on how much you are paying for that skimmer (skimmer prices are all over the place) or if you are doing a DIY.
I don't want to be arguementative, but would like to discuss this, so veen do not take this wrong at all please, but I would like to have a good discussion about this.
How am I in them minority with the belief that live rock and sand is NOT the best filtration? If it was the best filtration then public aquariums around the world would be ditching their MASSIVE skimmers and fluidized bed filters and simply adding as much live rock as they could into HUGE sumps. The fact of the matter is that live rock and sand do not export excess nutrients, but instead only hold some beneficial bacteria that help in the the stable nitrogen cycle. So simply put, anything that has surface area can be used as a substitute for live rock and sand. The key to filtration is to export the excess nutrients effectively, whether this be with skimmers, massive water changes, etc.
I am not arguing against sand and live rock, they serve vital roles in the asthetic sense, and do have a small part in filtration, but not a vital one.
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