The plant is thriving in its fourth week of the 12/12 light cycle. Watering with CalMag and pH Down. I also gave it one extra feeding of 5 liters with Simplex PK Boost (1 ml/L).
The hydroponic plant is about twice as wide—it has completely filled the 40x40 cm grow box. The fan leaves are nearly the size of a palm, and the foliage is dense. The day before yesterday, it shed four lower fan leaves on its own. It seems 40W of light is becoming insufficient. I’ve added Hesi Boost and Hesi PK to the nutrient solution, following the chart dosages.
Every day, I top up with 1 liter of water containing CalMag and pH Down. I’m thinking about setting up an automated watering pump to run once a day. I’ve noticed the pH dropping to 5.5 daily; adding 1 ml/L of SillicX and a liter of filtered water brings it back to the 6.0–6.2 range. By the next day, however, it tends to drop to 5.5 or lower. It might be time to completely replace the nutrient solution.