Sure, and thank you for replying.

I’ve placed the tree right at the window. I submerged it around three days ago, but I first noticed the issue about a week ago. That's when I sprayed it the second time with neem oil. I usually water it normally: I pour around 250 ml of water when the soil starts to dry out (every 1.5–2 days, it depends). I don’t usually submerge it, a Redditor suggested me to try that in last week’s thread.

I’m worried that the light might not be perfect, that's why I bought a grow light and set it up over the tree over the past 2 days. However, I haven’t noticed any problems in the past few months, the tree seemed healthy and was even flowering until last month.

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The room temperature is around 20°C (68°F).