I don't think you can culture DT's. It's actually a blend of three different types of phyto (Nano, Iso and Tetra I believe). The way I understand it, people were doing just that, so they changed their formula to keep people from using theirs as a starter culture to make their own. That last may just be an urban legend, though.
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All opinions in the above message should be taken with 35 ppt salt.
-Mike C.
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