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WHy do you think that there is such a need for live rock? Live rock does a good job of denitrification, but so does a DSB. There are many people that are simply uninformed, as you have stated that a skimmer does the same work as live rock...this is totally wrong. A skimmer takes out organic matter from the water column, the live rock is simply a place where denitrification can take place. Proper tank vaccuming and water changes can elilminate the need for a skimmer (though I would still recommend one, I have seen quite a few successful tanks without one) A fish only tank can handle high nitrates a lot better than a reef tank, so you can even get away with being a little bit lazy on the water changes. If you put a cheaply priced hang on back refugium on the back of the tank with macoralgae and mangroves, you can even go longer between water changes because of the exportation of nitrates taking place in teh refugium. There are very cheap ways of going about fish only saltwater, and even reef tanks, you just have to be willing to study the different ways of going about setting up one in an inexpensive manner, and then be willing to execute the correct steps in taking care of it.Fishy411 said:Well Fish Only Would still cost a lot becuase without Live rock you Need an Excellent Skimmer. Plus if you compare the ongoing Price I am sure That you will Notice a margin that gets ever bigger between the salt and freshwater tanks. I too Enjoy saltwater Tanks And am Switching to salt in the Future but If you arent Very COmmitted You preobly Wont be successfull