Thank you so much for your reply! I will really be disappointed if it's overwatering after all what I do to stick my finger deep in the soil. I water it every two weeks or may be more! Here are some pictures for the whole plant.Its not from Potassium deficiency it most likely from over-watering in the past. A plant pushes water through to the edge of its leaves, and if given in excess, this can cause veins at the edges to burst, which leads to browning. The light colored leaves may be an indication you need a complete fertilizer but it's hard to say with the photo you have. Can you post a photo of the whole plant in the container with the soil.
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