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Howdy Hooter
Welcome
Is it on all fan leaves? 
Might need some cal- mag.
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Look at the back side of the leaves might have a pest.
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I agree. Check for pests, and a few more pictures of a few more leaves would be helpful.
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Wouldn’t there be pest waste( 
) or eggs left behind with that much damage. You definitely know more than me so please teach Sensei 
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@DoneDeal
Not always. But you will see activity of feeding on the leaves. It’s much easier to spot. Pest waste is so small, you would almost need a microscope to find it.
So in short it’s much easier to see something moving, or from where they ate part of the plant.
The above picture looks similar to a thrips problem. I’ve had them, and their easier to rid than spider mites, but neither are desirable to have.
I circled an actual thrip on a leaf of a picture stolen from the internet. Thrips “usually” hang out near the veins of leaves, undersides, and the crooks of where the leaves near the stems.
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