yellow rusty leaves

Hey Growmie, It looks like the plant is suffering from being overwatered, you can tell because the leaves are drooping but the stems of the leaves are still pointing up. Also, your ph is causing a calcium lockout, that's the reason for the yellowing of the leaves, try bringing it up to 6.2, and always try to keep it between 6.2-6.5, hopefully, this was helpful, and remember ... "Happy Growing" and "Free your mind one puff at a time".