base rock is at least ten times the price of tufa. i am going to go with tufa, as i have no heard any bad stories about it, and i think jon's tank is a testimony to success with it. should it ever cause grief, i can pull it out. sure it will be a hassle, but i'll have only lost a few hours wages.
apparently true tufa is lava rock, the red stuff, while the white/yellow stuff i am talking about is not. the white/yellow stuff is apparently calcium carbonate with extra minerals in it, good for plants, which of course means bad for reefs. the idea would be to control water quality and keep calcium high until the rocks are covered in coraline, which would prohibit algae growth. i'll keep everyone posted on how it goes.
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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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