Looks like over fertilized to me. When there's too much fertilizer in the soil, the salts crystalises on the pores of the new leaves to become brown to orange dots. You can try watering with lots of warm water and discard the drained water, dry the center of the plant and for 1 month, give it only water.... no more fertilizer... it should clear up.
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2004/04/12 12:03pm 
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我是用泥炭土＆蛭石＆珍珠石，以1:1:1的比例混合
