bob thanks for clarifying that and posting an image of a giant white thing eating a smilie. 
once again, i am stuck between tufa and base rock. so far no one seems to have any base rock to sell and the JL stuff is expensive compared to tufa, which is available in calgary or can be shipped from eastern BC by the people who actually mine it.
i have only read one case of tufa being in a tank overrun with algae, and there's no guarantee the tufa was actually a cause. there are many tufa success stories out there, however. jon (canadianman) also has a lot of tufa in his tank...
http://members.shaw.ca/reefs/canadian_man/index.htm
i am about to begin exam week but once i'm done with that i will probably make my final decision, i will keep everyone posted.
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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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