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I never use a lot of live rock because I do not want any hitchhikers in my DT. Along with the beneficial bacterial seed, comes crap, especially crabs, which For the most part, are trouble makers. In addition, in the past, I got a rock which was a phosphate factory, likely sat in a tank with algae for years then given to the LFS.
Today I use dry, carbi-sea rock which is dry, dead, but covered by pinkish purple coraline algae and looks fab right away in the DT. I seed this rock with I small piece of live rock to seed the other rocks.
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