Is this not classical overwatering symptom?
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Is it? I thought overwatering discoloured the whole leaf, but I admit I am in need of plant care education.
Ctenanthe lubbersiana? That patch with the darker spots looks fungal to me. I would check the roots, if they look healthy not dried up or rotten, I would get a fungicidal spay like captain jacks. Applied at night to avoid burning leaves. Could be an airflow issue as these plants like to be evenly moist and in relatively higher humidity or they crisp up along the edges. Without some good airflow fungus can spread.
Here is what the product looks like:
Thanks, I'll take a look! I did check the roots recently and couldn't see any rot. It's always been in good jungle soil with airflow and drainage so I have been at a loss for what it needs.
It is a Ctenanthe! Thanks again, I am not sure about lubbersiana, but now I can check more easily.
Someone call SCP-049.