Athosanswered grow question 7y ago Really dark leaves, burnt tips and lower leaves dying,..
I see 2 glaring problems, (i) your nute strength is too strong, waaaay too strong, I mean 2.5 EC (1250 PPM) in soil? I would never go higher than 1.4 EC (700 PPM) in soil.
(ii) 3 liters of water per day? Are you sure the pot is dry before watering again? Even more, if you are over watering, I suspect you might not be giving the plant enough time to consume a feeding before doing it again. When feeding in soil, you should give the plant 7 to 10 days to consume whatever nutrient you gave it, before doing it again.
If it were me I would flush the soil