Update end of week: plants growing a little bit faster (sunny days finally came!) and look healthy. Added a little bit of coffee in plant 2 a couple of days ago. Continued with ATA Rootfast in plant 1 (1ml/l).
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Plants are growing a little bit slow due to weather conditions (not as sunny and hot as expected) but look healthy. I will update by end of this week with the progress.
Plant 1: growing with ATA Rootfast (0,7 ml/l)
Plant 2: growing with natural root stimulator made from lentil sprouts (100 ml/l)
I have to say that plant 2 did not look as strong as plant 1 when the seed germinated.
Growth at this stage is painful to watch, in a few weeks you'll feel like everyday your plant is showing new growth. I'm under 5 harvests in experience, but your plants are looking healthy IMO. Keep posting and thanks for sharing!