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Red/brown spots on leaves

Hi!

I’m having a hard time with my plants. Pests - insects, diseases, etc. Trying to save them, and doing extensive research how to handle those, but couldn’t find an answer for this:


Those are just two examples, many of my plants have those markings. Some of the plants have had insect problems (1st picture - calathea warczewiczii), some of them haven’t (2nd picture - agave quadricolor, haven’t noticed any insects).

What is causing those red/brown spots?
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