Leaf tips turn yellow

Hi guys
This is my northern lights automatic plant

Medium:soil(not mutes yet)
Ph:6.5-70
Around 12 day years old
Light schedule:18/6
Light:6500k 24w cfl light x 2

is it look like healthy or just fine?
Thank !

Unfortunately it’s not healthy. Appears to be overwatering because the soil is quite muddy. I’ve attached pics of healthy seedlings.