Brown/rust colored spots on leaves.

Hello. I am need to growing. It seems like I am always reading online just about everything I can to learn how to grow better. I have pounded forms trying to learn my mistakes and advantages. I have tried to figure out why my plants keep getting brown spots that kind of a rust color. My leaves in veg are beautifully green and healthy. I switch to flowering and they look great for about a month. Then I develop brown spots. The leaves can turn pale. Most of the leaves will turn yellow around the edges and then turn completely yellow. They dry up and fall off.
I started with Fox Farm happy frog and FF nutes. Learned real fast from other posts alit of people have trouble with FF. Talked to friends and was turned into Roots Organic. Terptea dry nutes with some liquids like HPK.
I use grow, bloom, bloom boost, fish protein. Cal mag. I will post a pic of some plants and leaves. I am in a 5x5 tent with two sunsystem 315 lec lights. Fans, exhaust fan/filter.
room temps highs are around 80. Lows at night are 65/70.
I vegged 6 plants of blue dream and yielded 18oz.
I did 2 Tahoe og that are drying and the buds are amazing.
I now have 9 Tahoe OG about 5 weeks into flower. I only vegged these for a couple weeks. Keeping them short. But they just started with the brown spots. I am frustrated. I feel my yield is suffering.
I tried all the common deficiencies/nutes/PH/PPM.
can someone tell by my pics. what I can look into.

why are you using calmag?
are you running ro? if not then no reason for.calmag unless plants asking for.it or you running coco
imo youre overfeeding and have ph issue/lockout. you keep feeding calcium the plant doesnt need and its just building up in the soil and immobilizing other nutes. then youre giving boosters with high p-k and throwing everything outta whack. can you check runoff ppm bet its high af. and ph will be likley be low. thats generally the first sign. if you continue it will get worse fast.
when and how much pk.boost are you running and at what times?

also
fuck fox farms. just throwing that one out there.

Jjgrow420 said:

also
fuck fox farms. just throwing that one out there.

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I used fox farms first grow not again

Mattcheck said:

I used fox farms first grow not again

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they have theyre place but i find alot of new growers buy into fox farms for some reason. im sure their line is ok but when mixing it with hot soil you need to be mixing much weaker solutions than stated in the feed charts and monitor for signs of stress.
many people think more is better when in reality its the opposite. you want to give it enough. not too much not too little. when youre riding fine lines basically double feeding its easy to waver off and get into trouble with overfeeding. dial back those nutes big time.for a bit no boosters just a+b weak and try to get her back on track with phd water. thats what id do anyways.

You didn't give any info on amounts of feed. EC, pH. It's a calcium deficiency. Could be caused by pH issues, also excess P, K, and Mg can lockout Ca.

Desperate for advice ! Found these leaves on my 12 week old indoor plant. As well as many other leaves with brown spots on them, some leaves fell off plant, like their dying. I run temp at 72-76 humidity 55-60% use spider Farmer led grow light plants are in 5 and 7 gallon fabric grow bags with Fox Farms Ocean Forest soil. I’m totaly new to the growing so excuse me if I come across a lil naive. Yeah I’m freaking out at all this because I have so much time and.money in this grow, and hoping it wouldn’t be a failure for me. But looks like that’s exactly what it is,,,, sad to say ! Thank I’m advance to anyone who will help me ! I need all the knowledge and advice I can get.

Blessed2BeMe69 said:

Desperate for advice ! Found these leaves on my 12 week old indoor plant. As well as many other leaves with brown spots on them, some leaves fell off plant, like their dying. I run temp at 72-76 humidity 55-60% use spider Farmer led grow light plants are in 5 and 7 gallon fabric grow bags with Fox Farms Ocean Forest soil. I’m totaly new to the growing so excuse me if I come across a lil naive. Yeah I’m freaking out at all this because I have so much time and.money in this grow, and hoping it wouldn’t be a failure for me. But looks like that’s exactly what it is,,,, sad to say ! Thank I’m advance to anyone who will help me ! I need all the knowledge and advice I can get.

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Can you show us a picture of the plant its self, and also tell us what you are feeding her. But just from the leaves you showed, I am thinking it's a phosphorus deficiency!

heres pictures of the plants