Answer: That could indeed be salt deposits. Salts in water and fertilizer (chemical fertilizers are basically mineral salts) accumulate in the soil and over time can kill the plant as it is absorbed through the root system. When you water, let the water run slowly and deeply through the entire pot and out the drainage hole. Do this at least once per month, or perhaps more often. This helps leach the salts away. It wasn't clear to me if you just added some more soil or completely repotted in all fresh soil, which is what I would suggest. Hope this helps!
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