01-24-2010, 02:24 PM
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Plants frequently react to changes in water parameters, lighting, and/or nutrients by melting, browning leaves, etc. It can also be due to inadequate light and/or insufficient nutrients.
Crypts are notorious for "melting" at any of the above changes. Just leave the roots, they will usually come back with new leaves, sometimes within days, sometimes weeks. Crypts are particular in requiring stable water parameters and quality.
The brown on the Sagitarria may be light or nutrient related. Originally you mentioned a 15w tube, why did you get rid of it? It might have been preferable to a desk lamp. Not sure, just a thought. And are you using any fertiloizers? Nutrients have to come from somewhere, and with soft water (as I have) with little or no mineral content plus few fish to provide waste and minerals from fish food, liquid fertilizer is likely going to be necessary. A good comprehensive fert like Seachem's Flourish Comprehensive, Kent Freshwater Plant, or Nutrafin's Plant-Gro will work.