calcium/magnesium deficiency?

Almost 5 weeks into flowering and my fan leaves started to show some rust spots 2 days ago. Have not used anything that supplements calcium/magnesium. Added 1tsp Epsom salt to my plain h2o watering yesterday. The leaves are a little worse today and it spread to a couple more fan leaves.

Is this a calcium/magnesium deficiency?

600watt LED, 3 gallon fabric pot, FFOF soil, bag seed, 32'' tall, 12'' away from light, using grow big/big bloom/tiger bloom nutes, 1 gallon water every 48 hours when pot is bone dry and light, temps 71-78, humidity 35-45%, ph of water 6.8, ph of run off 6.5.

Yeah that looks like CalMag to me, I've seen it a couple of times now. Your pH and everything seems to be all good. Maybe another dose of epsom or another calmag supplement and see how that goes.

Maybe also flush with water and then feed straight after, that's what I'd do.

Nice bud

DazeHazy said:

Yeah that looks like CalMag to me, I've seen it a couple of times now. Your pH and everything seems to be all good. Maybe another dose of epsom or another calmag supplement and see how that goes.

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Thanks for the reply. It's been 10 years since I grew, everything was going well until this. I never used cal-mag years ago and never saw rust spots. I'll be using it tonight.

leather lungs said:

Nice bud

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Thank you. I'm impressed with the cheap 300w LEDs I bought.