Check make sure your tub isn't soaked, especially when transplanting you need to treat the coco like soil let it dry out and let those root explore that new coco.
check the weight of your container and if its heavy as hell don't water, if you keep watering it will cause IMO PH problems and that could be whats happening, I have a cut that shows rusts spots if I over water without letting the roots fill in.
check the weight of your container and if its heavy as hell don't water, if you keep watering it will cause IMO PH problems and that could be whats happening, I have a cut that shows rusts spots if I over water without letting the roots fill in.