whether they're sheep or not, it looks like everyone does DSB's. the alternatives are either huge water changes, a heck of a lot more skimming, or a wet/dry. it seems like a lot of people agree DSB's need to be changed every few years. i think i'll continue with my current plans, 4" in the main tank and 5" in the sump.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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