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Color of water

I respectfully disagree as to a "Reef tank set up for 3 years WILL have
yellow water."  Not necessarily.  Jaubert reports "a not yet understood
process" in the Living Sand over clear water sump system removes color. Some
reef tanks have color, some don't. OK, MOST do. 8^D

I have had them both ways. Some with no trace of color, some pretty yellow.
Colorless water is most often associated with very mature tanks with very
healthy "live rock," and NO fish. Corals OK, but not fish. 

DE filtration often removes all traces of color, so color is not always
gelbstoff.  Yes, it USUALLY is, but not always. 

Hey, I NEVER make mistrakes.