Slow growing, one yellowing.

Ok, first pic is both plants side by side. As you can see one is doing better than the other one. Really not sure whats going on. They were both planted on Jul. 14th. Now maybe im expecting results too fast but, shouldnt these plants be bigger? The plant that is smaller is starting to droop and i turning and almost neon green color bordering on yellow. The one that is bigger is yellowing on the tips of only two of the blade type leaves. I use a moisture meter to tell when the soil gets dry and when its dry, i saturate the pots till the water runs out the bottom. Plain water ph is about 6.7 or 6.8, no nutesi even put one of those ph probes from lowes in the soil and its telling me the soil is 6.8 to 7.0. They are under 2 100w equvilent bulbs @6500k and one 150w equvilent bulb @ about 2700K with a small fan oscillating over them. Temp stays around 75 to 80. 18/6 schedule. One last thing, the soil is Miracle-gro organic soil with extra perlite i addedand a layer of red lava rocks on bottom. Im thinking maybe even the organic miracle-gro is shit.

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