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#2
12-12-2012, 10:23 PM
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All of the above and then some. Wrong light, nutrients too high, they're just in a mood, all can contribute.
My current frag tank is 0ppm on NO3 and PO4, 400w MH and still pieces are turning brown. Often it's just time needed for the tank to become mature, which is not a measurable parameter
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Brad 
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