Sour alien livers, coco and hps

Using these babies to experiment a bit more on watering frequency and quantity. If you haven't noticed noticed by now, there are stuffs I just can't learn by reading. Everyone seems to be able to perfectly time coco watering by weighting the thing, therefore being able to tell apart a 2.8kg pot from a 3.5kg pot. When I lift the pot, I just feel my anxiety telling me it's probably underwatered). Anyway, trial and error seems to be working since the baby is praying so far. What's working: I did NOT presoak the soil, i watered nuted water just on the seed when planting, around 400ml. After it sprouted, another 500ml, mostly halfway to the side. 500 more ml every 2 days then. Until end of day 7. I won't try to get runoff before end of third week.