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I tried it. Im with wayne on this one...they rubble becomes a detrious magnet...and its hard to clean. I did it because I didnt want bare bottom any more. Lets face it, even with bare bottom, its near impossible to blow all the detrious out. And now it just sits there decomposing w/o sand to help digest it. And now with rubble that prolbem will become many times worse. FWIW, a medium sand, 2-5mm is the best substrate around. Doesnt get all funky and hard to clean like the sugar aragonite, and just leaving a 1" layer all over is enough to keep everything happy. It almost cleans itself...and what it cant, you can now at least have sand-sifting organisms to help out as well. All that even a 180g needs to keep its sand perfect is one sand-sifting goby...they rock!
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