It looks like your plant is definitely struggling, but youâre not far off. The yellowing from the bottom and the slow growth point to a nutrient issue, most likely nitrogen deficiency or generally too light feeding, especially since youâre using inert soil. In that setup, the plant fully depends on what you give her, so if the nutrients are off, growth will stall like this.
I would slightly increase your nutrient strength and make sure your pH is in range, otherwise she wonât be able to take anything up properly. Also check your watering habits, donât keep the soil too wet all the time.
One more thing that might really help you: I actually use the exact same light for seedlings. Iâve noticed the same issue once plants get bigger. I canât say it for sure, but I suspect the spectrum isnât ideal for later growth stages. When I use my main grow light from the start, I donât have this problem.
Also, whatâs your relative humidity like? Could it be that the plant is getting too much direct moisture from the humidifier? If the leaves are constantly hit by condensation, that can also stress the plant.
Maybe that helps you.
Stay True! đ