cant tell whats wrong

Jakebakingcake

Chillaxn'
well it week three today and my plants are growing well . but some of them have yellow tips on a couple of the leaves. i have been told this is due to over watering.. but that cant be considering i only water when the pots are very light wieght when i pick them up. about every 2 days or so. it cant be a ph problem because i test the ph. and i dont think its nute burn because i dont use any nutes yet. what could it be?
 
well it week three today and my plants are growing well . but some of them have yellow tips on a couple of the leaves. i have been told this is due to over watering.. but that cant be considering i only water when the pots are very light wieght when i pick them up. about every 2 days or so. it cant be a ph problem because i test the ph. and i dont think its nute burn because i dont use any nutes yet. what could it be?

How big are the pots?
 
im using a 2ft t-5 2 bulb light and the light is about two inches away from the top of the plants. the pots are plenty big. theres a picture of them in my gallery. but the root system hasnt out grown the pot yet. and im using a sunshine professional growing mix soil. and i sprinkled a little bit of foxfarm ocean forest on the top about four days ago.
 
and i might add that not all of the plants have the yellow tips some of them are completley green. but four of the six have some yellow somewhere on the plant.
 
it means that the leaf is saturated with all the nutes it needs. this is what happens before you cross the line into overfertilization. plants look good.
 
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