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Why doesn't anything live in substrate?
Another newbie question:
I've seen marine tanks where the substrate is alive with many types of
worms and other goodies that digest waste, and keep the substrate aerated
and "alive." When I ask my marine tank friends, they say that it "just
happens" and they never added anything to their tank (other than live rock)
I've never seen a freshwater tank with similar beasties. Why not?