orange spots on lower leaves

E-indoor or outdoor (indoor)
E-soil,(soilless)
E-specific medium
CSL-Soil type/brand (shultz seed starter and mg potting mix)
(i dont do the ph thing)
E-Water source (tap water)
E-Age of plant(1 month)
E-Type of fertilizer(mg yes i know it sucks but im broke)
E-Lighting source and distance from plant (100 watt walmart special 4")
E-Air temperature (anywhere from 70-77f)
E-Lighting schedule(24 hrs)
E-Type of ventilation your closet has(box fan)

i have orange spots on the lower leaves and looks like it is starting on the first set of 3 leaves. the first set single leaf have the orange spots and a 1/4" of the tip looks like it is dying i read that i don't need to use mg mixed with the water to i flushed the plant and it doesn't look like it helped im new to this and confused my stem at dirt level looks really tiny compared to the top also is this nitrogen def.? i have used neem oil to get rid of tiny black flies and it worked with 2 sprayings 7 days apart here are pics there are also very faint but purple veins om lower leaves
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