What is this? Calcium def? Something else?

ok, several of my plants are showing this, some worse than others. i have a few pics, it looks like it could be calcium or magnesium to me. could use some expert opinions. i think a flush couldnt hurt, no? them maybe some calmag ferts, which i will have to go get.

here are a few pics, any input is greatly appreciated the last pic acually looks more like white spots than dark rusty spots

Well I'm no expert, but from what I've read I think you may be right about a cal/mag deficiency.

Try some calmag or epsom salt?

Good luck.

I am sure you already know to use Cal-mag when you run a RO/DI system right.. If u dont use Cal-mag than I would get on it asap and this is most likely the case. Your plants look pretty well balanced. My plants usually start to show the same symptoms once every 3 crops. I try to correct it with Vitamax and ensuring I am correctly applying my NPK, 3part feed formula.
It seems to be on the fan leaves first-thats a good sign. And seems to be all over-another easy thing to correct. Maybe run some epsom salts- very cheap and very simple to do.. With out knowing to much, when in doubt-epsom salts seems to usually work when it comes to trouble shooting..

thats weird

thanks for the quick responses. i have some epson salt, i can hit them with that. or wait till i go out tomorrow and get some cal mag fert.

i may hit em lightly tonight and more with cal mag tomorrow. wish i wasnt in flower id just foliar feed it, but thats out. again thanks for replys.

i use epsom salt to fix the problem but it only work for a short period of time till you can correct it for real..but thats just my experience it works well for others though

also remember to much mag can block out cal

yeah, ive given them no extra mag so far

lights are on, just got home. gonna hit em with some epsom salt 9.8 mg, and some calcium 19%, also has some nitrogen. also i got some nice iron/micro nutes. how much of this calcium should i use. its only got directions for like apple trees or large areas. heres a pic of the stuff and the calcium.

Hey
If you are gonna mix your stuff make sure it's really fine.. I can assure its def not calcium.. Ill write back in a bit, phone call lol.