Help please!!!! leafs tips and spots

So my a couple of my plants are experiencing problems a few leaf tips are turning yellow to brown to blackish and with white spots. I put a few pics up. Those dots dont move but feel like they dtill might be a bug problem. Anything helps
 

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Doesn't look like bugs. Possibly nuts or light burn. How's your ph? What's the underside of your leaf look like? Can you see moving bugs??
 
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