Hulkberry first run

you pot looks very small and also does not ensure good airflow. your plant might show signs of suffering due to its great structure and minimal room for its roots. i would "highly" (see what i did there) recommend to place your plant in some cotton pot 💚 best of luck!

Take a look at the feeding schedule. https://www.biobizz.com/wp-content/uploads/2023/10/EN-Nutrient-Schedule-EN-2023.pdf I think you are under feeding them according to its recommended ratios. Good point about bigger plants in smaller pots they will be drinking and feeding more. Will need more frequent irrigation's. Bio bizz also recommended adding in CaMg at about 1ml/L its on the bottom of the feeding chart and not going below a PH of 6.2 or above 6.5 If you are not monitoring the concentration of your feeding solution it would be a good thing to get into until you know it like the back of your hand. This helps figure out if the solution your mixing up is enough for the plant. Also good to get into the habit of giving the plant a bit of runoff as well. like 10-15% pots volume. This helps prevent any buildup in the substrate. Any TDS will work. some a better other not. EC is ideal vs PPM but both work. Good Luck!

Hello mate, with all probabilities this problem is linked to the ratio of Ca/Mg. You are feeding the plants with organic products so you need to have a perfect balance of the pH soil so you must have the perfect ratio of Ca/Mg in your water (3/1 or 4/1) otherwise you will have a salt crystallization in the salts that blocked the uptake of the other nutrients. Good luck and happy harvest!