Green marks on the undersides of my stromanthe triostar- what’s wrong?


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Hi there I really need your help!
My stromanthe triostar got green stripes/ marks on the undersides of her leaves. They wasn’t there when I got her in a local gardening center some months ago and I’ve never seen something similar.
Let me tell you a little bit about the conditions she lives in:

I have her right next to the windowsill of an west facing window. For soil a used a mix of indoor plant soil, succulent soil and some orchid bark.
I try to water her as soon as the soil gets almost dry and use a hydrometer for help. I water her with rainwater or with tap water (in Germany we have hard/ calcareous drinking water).
The humidity is kind of low with 53% but is strongly varying between 43% and sometimes 76%.

I really don’t know what to change or what to look for when moving in some weeks.
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Welcome to the forum @eemmyi :) your plant is on a radiator and if the heating is on it will be unhappy and dry out too much. Although this plant likes to be kept warm and in a humid atmosphere it also needs more bright light, just out of direct sun. At night when it is dark you will see the leaves curl and they will show the colour underneath.
 

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