pics showing same problem on 3 plants, please help im worried.

not sure is this is calcium deficiency or septoria, three plants that are about 4weeks old have symptoms but not the 4th young plant. I appreciate your help thanks.
 

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Sorry about the duplicate thread post, i cant find a delete option. Here are the pics uploaded.
 

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looks like it some leaves got splashed with water or nute water or touched the wet soil after watering? Those pics from a bottom leaf?

If you get water drops on a higher up the plant leaf under HID lights, they can burn like that...

The pic of the whole plant looks just fine...
 
looks like it some leaves got splashed with water or nute water or touched the wet soil after watering? Those pics from a bottom leaf?

If you get water drops on a higher up the plant leaf under HID lights, they can burn like that...

The pic of the whole plant looks just fine...
yup was thinking same thing was gonna ask what part of the plant has the spots on them
 
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