calcium deficiency or manganese deficiency or something else? Please help

Can someone tell me what this is i put my plants into flowering bout 3 weeks ago Ive been using general organics line from the start. When put into flowering ive been following the directions and addin 2 tsp of bio bloom and 1 tsp calmag per gallon of water and watering every second day when pots are dry. ive noticed on a couple plants that my leaves have been getting brown spots but im having trouble diagnosing problem and its starting to get concerning can anyone tell me what this is please.

Yea, that's the start of magnesium and cal def. The rust spots are probably from under-watering and/or PH being off. Calmag @5tbl per gal every other watering for a bit.

You can use Calmag or I like to use Epsom salt 1Tbps per gallon will get rid of any Mag Def Id say every other watering for this method as well although after the 1st watering you should notice it helping within a day or two if it will. The brown spots wont come back but it will stop spreading.

Ive been using calmag every watering since start of veg. I guess just not enough since general consensus is that is is indeed calcium deficiency. Ill increase doses significantly and hope for best. Im starting to loose fan leaves at alarming rate i seriosly need to get this figured out

Sorry to hear about this man, I hope you can turn it around. It may take a week or two.

DAMN! That sux

It is more likely too much calcium or mag causing nutrient antagonism leading to lockout.

I would likely give fresh water to the set medium and then add back a lower dose of balanced nutes. And no cal mag.

You did not mention what your water is like. It is the most important factor in my opinion.