Is my plant going to die?

Not sure what to do anymore I have two autoflowers 1 with brown spots one with droopy leaves they are in coco perlite mix I use ro water with calmag and green planets nutrients. I don't know what to do anymore ready to just tear this thing out. Also these are starting to show up on the left one

You need too give more info on your grow.

I use 250 w qb lights they are about 20 inches away Temps range from 76 to 79 when lights on 74 73 lights off I water once a night I have been using green planets medi one line at 1 third strength and full calmag so 1.5 ml per L I mix the calmag than each nutrient one by one than ph at the end to 5.8 5.9. Humidity is pretty low but can't get it up much more have a humidifier in there and it's at about 36? What other information should I add?

Here's some lights off pictures

1.5 per L of Calmag is 6 per gallon which is high.
3 per gallon is plenty.
Humidity is a little low but not seeing that as the problem.
I don’t grow in coco but everyone who does seem to indicate you have to water a lot and can’t let it dry out or it messes with your pH, and PH would be my guess here.

I see so maybe I should be watering twice a day? And ok I thought maybe I wasn't giving enough lol on the bottle it calls for 1.5 per litre I should lower that? This is my feed schedule I do a third strength I water then both 1 liter a night

3 gal fabric pots

I could definitely see the ph being an issue I moved them from my cabinet for veg to my tent like 2 weeks ago about a week ago I started to notice the problems the tops of the pots always get dry I shouldn't be letting that happen I guess? Should I start watering twice a day and see where that puts me in 2 days?

Hopefully a coco grower will chime in here ...

Looks like a phosphorus and start of magnesium deficiency. Both can be caused by lockout from excessive calcium.

I'd recommend using minimal CalMag. I stopped using it with my RO quality tap water. Easier to add in if you start seeing calcium deficiencies.

Don't bother feeding a specific amount (i.e. 1L) Ensure when you feed daily that it's to significant runoff, excess salt build up can occur otherwise.

Ensure you measure pH of your nutrient feed before each feed as well. A second feed won't hurt as it's best to make sure the coco is always moist. The EC of the coco will rise as it dries out.

What EC/ppm are you feeding at?

What PPMs are you feeding and how often? You said you are using Medi One at 1/3-medi one is an organic nutrient and you will see deficiencies crop up quickly with liquid organics in coco. Depending on the specific product, organic nutrients might not register on a TDS meter. Honestly, what I would do at this point is buy a bag of Maxibloom and start feeing it at 500 PPM (5.8 ph) twice per day with plenty of runoff-this will set your grow straight and fix your deficiencies. You need to get a healthy grow under your belt first before messing with organic nutrients. The sooner you start this the more likely it is your plants will survive.

Watering to decent run off is important once your plants get big enough. It helps keep the ph and ec of the medium stable. I tried to be stingy with it and my ec climbed and ph dropped.

I water 2x a day, lots of guys put drippers on big plants. Coco can be watered all the time. ( if it isn't silty fine coco, you want the course stuff tht you rinsed all the fines out of and it needs to be treated before use as well.
I am still tracking my run off ec and ph. Maybe once I get more experienced I will not have to. Right now it helps my noob skills learn to read plants. I am using it to correct my overfeeding tendencies.

I switched to dyna gro but maxibloom is a great suggestions well if you want something easy to use. Mix maxibloom powder with some hot water to dissolve it easy, then mix in the rest of the cold. Heat wont hurt it, I wouldn't boil it for days though

Your plants look extremely savable.

If you are interested.

I haven't really check too much I just checked the other night and it was 350 or so and ec was only like .8 and I feed two day than just cal mag only once a night and that usually gets me a bit of runoff I was thinking of switching nutes all together maybe flora series but I don't want to spend a whole bunch again restocking.

I am going to start twice daily feedings I'm confused though because I need alot of nutrients to get ppms up to the recommend levels and than im scared of burning then so I should decrease calmag and up feedings both in feed and frequency sorry for all the questions I'm just stressed to hell about it lol should I turn my lights down to 75 until they recover?

How much runoff should I aim for a few drips or a little puddle?

Damienthebong said:

How much runoff should I aim for a few drips or a little puddle?

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Significant runoff. 20% of more of what you put in should come out of the bottom.

Normally though say 20% run off, check ec and ph in your run off and you wont have to guess what is happening there.

Switching nutes wont help because they are better( all the same stuff basically ). Switching nutes might help it they are easier to use. GH 10 part isn't exactly convenient. I have a large selection of it. I did the dyna gro because it's a one part nute, it's not "better" just really easy and the ph is stable for days after I mix it.

So if I was to use maxibloom is that all I would use and ph it?

Damienthebong said:

I am going to start twice daily feedings I'm confused though because I need alot of nutrients to get ppms up to the recommend levels and than im scared of burning then so I should decrease calmag and up feedings both in feed and frequency sorry for all the questions I'm just stressed to hell about it lol should I turn my lights down to 75 until they recover?

Click to expand...

If you cut all the other nutrient by 1/3 do the same for the recommended CalMag, not sure why you wouldn't. The internet has lead people to think extra CalMag is always required with RO water, it's not. Stop feeding just CalMag. Don't touch the lights.

I would definitely like easier I actually hate mixing all the stuff up and because it's organic I don't like to mix and leave it for more than a day. Anything easier would be nice lol