Hey guys, I'm doing my second CFL grow and already I'm experiencing weird stuff with my one plant. I'm growing Joey Weed's White Russian and what started was the older leaves began getting these orange, almost rust-like spots on them. The seedling was transplanted into this soil about 2 1/2 weeks ago. I started giving it 1/2 doses of General Hydro's Flora Series nutes about a week ago.
The pH in the soil is about 6.8 or 6.9, there's plenty of drainage, and the plant seems to be growing fine on its own. The old leaves are the ones that are showing the most rust but new leaves that grow out however also get this orange rust crap on the tips after about 2 days.
Any ideas? I'm suspecting either overwatering or rust fungus. I hope it's not the latter..