Same size why won't it grow ...?

I planted this seed 3 weeks ago it grew up to this point but now it's seem like it's not any more? Could it be to much nutrients . Stress?

Does it look healthy?
 

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I changed the water and nutrients didn't put as much now . I'm using 5 cfl like the one is the picture and I have the water run like every 12 hours for an hour each time that's all I can do with the timer. And is this indica the other one I have growing witch is younger is huge .
 

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