Mag Deficiency?

I've been starting to have some problems with a couple of my plants.

I'm on my 4th week of flowering using FFOF soil, BMO nutes, 600w air cooled hps thats about 12inches from plants.

The problems started about a week ago and have gotten gradually worse. I tried flushing because I did cause a little nute burn and that hasn't worked. The problem persists. That lead me to think it was mold because it was spreading to other plants, but after some research I believe it's a mag deficiency. I attached a couple pics of leaves, let me know what you think.

Thanks, Josh

it would be outstanding if someone could confirm what I already think or tell me what is actually wrong. if you need more info or pics I can do that to

thanks, +++rep for help

It would be helpful to know your Ph since it looks like you've got a salts build-up not a mg. problem. Flush and start with nutes at 6.3

ph is around 6.8 and has been throughout the grow. i recently flushed and gave a fresh batch of nutes, but it didn't seem to do much.

It def looks like some kind of mag def. I get that shite in every grow on at least one or two plants. usually happens 4th and 5th week of flower... I have no idea how to make it stop. I follow the feeding sched. I got the Cal/Mag Plus... Ive tried Epsom Salt... wtf? finished product always comes out good, but id like to remedy this... so, im curious how to fix this too

sum pic of what the leaves look like on the plant would help/what are u feeding with ? sum nutes dont have enough Mg, u can balnce that with sum epsom salts, about a tblsp to a gallon. or sprinkle on grow med and water from the top.

Thanks guys, i got some cal-mag and am going to follow directions. It's what the hydro store recommended for me. I'll let you know how it works out.

Cheech Wizard said:

It def looks like some kind of mag def. I get that shite in every grow on at least one or two plants. usually happens 4th and 5th week of flower... I have no idea how to make it stop. I follow the feeding sched. I got the Cal/Mag Plus... Ive tried Epsom Salt... wtf? finished product always comes out good, but id like to remedy this... so, im curious how to fix this too

Click to expand...

if cal/mag and epsom salt didn't fix it....than it wasn't a mag def. Plain and simple.
The pic on the left looks like heat stress. the pic on the right looks like a ph issue and/or heat stress. Need more pics. Knowing from where on the plant those leaves came would also be helpful. Let me guess... the leaf on the left came from on top, but the one on the right came from a little lower down?

cal mag will fix it but it is cal def.

u can tell in two days after using epsom salts if theyre workin

kremnon said:

u can tell in two days after using epsom salts if theyre workin

Click to expand...

True true. Hey kremnon do you keep praying manti (or is it mantices?...manti sounds cool LOL) in your garden to combat pests or....I've know about lady bugs but....

Thanks again everyone. I watered yesterday with cal-mag and am waiting for results. Seem to still be getting worse but i'm giving it a chance to work. ++rep for everyone

It seems my baby is on the road to recovery and doing well. A good flush with a fresh batch of nutes and some cal-mag was all it took. Thanks again for everyone's input.