Hey all, new to these forums so I apologize if I do things incorrectly. I recently started growing 4 plants in 20gallon fabric pots. The medium is organic. 1 of my 4 plants is struggling and I was hoping someone can give me some advice. All plants use blumat drip system and all are fed the same organic cocktail of nutrients once a week. I also add a bit of white vinegar to the reservoir to lower the ph. Attached a picture of all 4 plants for comparison. Any help would be appreciated.