On my NLxBB there appears to be rust spots develop...

hi there so you have three problems. first of all overwatering, you can see from the "puffy" space in between the veins of the leaf and the wrinkled leaves that you're overwatering , this will actually shock the plant a slow growth. this article tells you what's going on with the leaves : https://www.royalqueenseeds.com/blog-what-causes-curly-cannabis-leaves-and-how-to-cure-them-n923 here s a fool proof technique that will help you figure out when you need to water : www.youtube.com/watch Third, and this the easiest problem, the actual rust spots on the leaves : calcium deficit. Calcium has uptake by the roots at around 15% efficiency, and by the leaves at around 9°% efficiency. So simply use a foliar spray with a saturated solution of cal mag , spray until dripping wet several times a week and the plant should recover within 5 days and start to thrive. hope this helps ! 🚀