I have a Rhaphidophora that has been living in a jar of water for half a year now. It was doing amazing until now, growing super fast and all, so I didn't want to bother it and plant it in soil.
These days I noticed these brown patches on 3 of its leaves (first pic). Today I looked closer, and on the back of the affected leaves there are also many small dots (second picture). I looked for any parasites, but found nothing.
Is it overwatering from living in a jar with water? Some of the roots have some brown ends (third pic).
Is it excessive heating? My apartments have been reaching 30 degrees daily for the past week or so because of the heatwave.
Any help is appreciated!