help with my seedling

My autoflower is growing with a strong stem but lime green leaves and doesnt look very healthy it gets slightly under watered and has low quality potting soil mixed with a little mushroom compost and earthworm castings.I dont have a way to check the ph but ive grown a lot of other seedlings without checking the ph and they grew an inch per day but this has barely grew in the past 3 or 4 days.It is under a 250 watt 3500k quantum board turned down to 25 watts about 9 to 10 inches away with 18/6.
 

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