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    Posted: January 24 2011 at 3:52pm
If I took fresh RO/DI water and mixed it up in a tank. Threw in some clean dead rock and dead sand and put it under lights, would it grow coraline algae over time? This is without adding critters. Where does the bacteria from the biological filtration come from? I'm at work again, bored and looking for answers. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SGH360 Quote  Post ReplyReply Direct Link To This Post Posted: January 24 2011 at 4:22pm
you need to have some coralline algae in the first place in other to spread. even a small rubble rock with coralline should suffice
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark Peterson Quote  Post ReplyReply Direct Link To This Post Posted: January 24 2011 at 7:32pm
Excellent question.Thumbs Up
Bacteria of all sorts occurs naturally in and on living and dead things, sometimes in a hibernating or stasis mode but in the tank you describe it could take months for bacteria to populate. And the kind that would populate would be just a few strains.
Coralline Algae would probably never appear in that tank, but....

The prevailing winds bring all kinds of marine algae and bacteria our way from across the expanse of the Pacific Ocean. If that same tank were placed outside where rain and dust would contaminate it, the time would be shortened and the diversity would be quite interesting.

One of the major reasons that starting up a reef aquarium using some LS, LR Macroalgae and LW from other hobbyists existing tanks is not only for the thousands of different strains of bacteria, but for a myriad of other bugs and worms that naturally live in our various systems.
Of course, Macroalgae has an extended important function because of how it grows immediately and eats up pollution as fast as pollution is produced by the recently moved LS, LR and new organic matter introduced with clean base rock and sand.

Also, FYI, the bags of LS sold in the LFS are nowhere near as useful nor do they have anywhere near the amount of bacteria of a single cup of LS from a good aquarium. And they have no bugs and worms. Approve

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