Rust on my leaves

I have a few plants that are 6 weeks in flower and I notice some rust spots on the leaves.
I have been using fox farm grow big big bloom and tiger bloom. Every couple feeds I've also added a teaspoon of molasses and in the first week I used big up powder 0 - 33 - 23 even less than the recommended dose. My pH has been around 5.7 to 6.0. I think it might be a Cal Mag deficiency ???
Any help will be greatly appreciated

Hard to tell from your pic. Check this out. http://www.growweedeasy.com/marijuana-symptoms-pictures

Bugs. Possibly thirps or mites. They start out as white dots then the dots go brown in center.

I looked really close and I didn't see anything also I didn't have any white dots. I checked my leaves thoroughly both top and bottom at least once a week.

I also think it calcium def

That happened to me too on some leaves and I think it is the beginning of more severe nute burn.

Wigiberto said:

That happened to me too on some leaves and I think it is the beginning of more severe nute burn.

Click to expand...

id agree it could possibly be some kind of nute imbalance causing lock out

Well the plants are starting to look a little better thank you everybody for all your help. I actually added some cal-mag and reduced my normal feeding.