Leaf discoloration and curling

I actually believe nutrients are not the issue here, but the light schedule and climate! 24/7 light on your plants may sound great but in reality it reduces yield and may even kill your plant before you get to harvest! Plants use the night time to burn energy (sugars and proteins) made by Photosynthesis and stored in the leaves to grow. The climate problem is the temperature in your grow space, 17-18 degrees Celsius might be manageable during late flowering but in vegetative growth the plant needs a temperature range of at least 22-28 degrees Celsius (28 being the max unless you use supplemental Co2). Humidity levels seems fine and as mentioned before me here keep your fertilizing solution at 1/4 strength at this point of growth and slowly increase as the plant grows, never go with recommended amounts straight away because it causes toxicities pretty easily! Hope this helps! Good luck and happy growing :)

I only fed them like a very little squirt one time and not again since. It’s been watered a few times since feeding.