Leaf tips and edges turning brown. Please help.

Coco
Ph runoff 6.1-6.3
Botanicare Pro line Nutes

Have a calcium deficiency issue that I am working through, using cal-mag. Since I started using it the tips are turning brown as well as the sides on 5 of my 10. Is this just a side effect of the plants coming out of the calcium issue or something else?

Been watering with 5.8 ph'd water because I was told to treat coco like hydro, but results are still 6.1+ run off. They do seem to be growing again however.

looks like overfeeding

be careful not to overdue it with calmag, once every month or even 2 is often enough. If you give to much of it you will end up locking out both nutrients. Cal and mag are trace materials required for healthy growth only a small amount is needed for the whole grow

I have been adding 5 ml of cal-mag per gallon (4L) since day one as my water is soft and lacks minerals, but i do have sight amount of brown tips so i may consider a reduction

how many mg of cal-mag are you using per feeding?

I've used it three times already, 5ml per gallon. So, yeah that might be the cause of the issue. It's Coco, so figured when I watered most of it would drain out. Guess that is not the case. Just started using it on Friday.

I was just getting worried, these were not going to make it. About to finish flowering on my other set, so was hoping to have these ready to go by that time. Not going to use it for awhile and just wait and see what happens. Also thinking of mixing coco and soil in next time, Coco is turning into a big issue.

my calmag says to use every watering.. my plants are perfect, no browning or anything so should i stop using it or what?

While I cant say how much to use or when because I do not use cal-mag myself I just remember this information from my research, I can point you in the right direction, heres a thread I found:
https://www.rollitup.org/general-marijuana-growing/505993-interesting-read-cal-mag-check.html

and the relelvant paragraphs

Calcium is an intracellular messenger as well and can send a signal from one cell to another telling other cells how to react or what to do. It also provides for the transport and retention of many other elements. Calcium, magnesium and potassium live in a delicate balance within plants. Too much of one will inhibit the other two. Finally, calcium is a co-factor in many enzymatic reactions. Its presence is needed to turn an enzyme on or off and allow it to catalyze a reaction.

How Cal-Mag Deficiencies Occur
The most common cause of calcium and magnesium deficiencies is lockout. When there is too much cal-mag already in the untreated source water being used as the base to the nutrient formula it can cause the good cal-mag in the plant food to become unavailable. Think about it this way - the cal-mag in your tap water has a large molecular structure and is very immobile in that form. These molecules try to go through your roots and up into the plant where they can be used. The molecules are too large to be absorbed efficiently and end up accumulating on the outside of the roots. This causes a road block that can lock out the good forms of cal-mag you are trying to feed them. Other key components of the nutrient formula can also be locked out and the problems escalate until your plants appear to be stunted and yellow and growth crawls to a halt.

That actually makes sense, and I may have continued to cause this issue by adding cal-mag to it. This:

• This causes a road block that can lock out the good forms of cal-mag you are trying to feed them. Other key components of the nutrient formula can also be locked out and the problems escalate until your plants appear to be stunted and yellow and growth crawls to a halt.​
  
  

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Is a what I know believe happened in the first place. When I started to use coco in the first place I added 9 gallons of water to the brick as suggested.. however I also mixed a spoonful of Molasses in each gallon.. I forgot that I had done this until I read the above. A video I had watched on youtube talked about doing this with "other" nutes, so I figured I would go ahead and add molasses... I bet I overdosed my plants from the beginning.

Have to figure out what to do now... Flushing has had no effect on them whatsoever. I did this when I thought it was a PH issue. How do I remedy this now? Damn, I wish I had known this before.

Live and learn... but still. All this time I've been blaming the coco and it was me all along.

Searched the forums, up and down googled etc. Having a really hard time trying to figure out if flushing will help with Calcium toxicity, IF that is even the issue here, which I am assuming it is. Going to start spaying with an Epson salt mixture. 1 TSP per gallon to little? To much? Will that even help?

My biggest concern is that my plants ate stunted permanently, hope this is not the case.

id just water with cal/mag free water for a while. If it is a lockout this will fix the problem with time. Your Epson salt spray is a good idea, as this will bypass the roots, I wouldn't do it more then once a week though. 1tbsp per gallon sounds fine. You could even try foliar spraying your calmag, since you have it, still once a week no more and dilute it more then you would if watering can feeding

oh side note, the best way to search the forums is to google the problem and add the word rollitup lol

nova1992 said:

my calmag says to use every watering.. my plants are perfect, no browning or anything so should i stop using it or what?

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how many mg/gallon are you using?

BTW...if it's working for you then don't change a thing

it also occurs to me that if u've added molasses to coco coir without adding microbes to break it down then you could also be causing problems from that. It also mentions in the article how soil microbes break down the cal/mag from tap water

Just an update. I forgot to switch the timer over to timer mode last night. Lights were on all night, all day. Most of the plants are green again, some have just small amount of yellowing on them. So, what I thought was calcium deficiency, really was and now I have calcium toxicity. But I'm happy to see my plants green again, that is a big relief for me. They also grew quite a bit. Now to deal with this new issue, but I'm confident that if I follow the advice here I will be fine.

So thank you everyone for the help. Could not have done it without all of you. No more molasses in the Coco!

Will keep posting updates here.

And thanks Billy and Adjorr for the article/thread!

JesterDev said:

Just an update. I forgot to switch the timer over to timer mode last night. Lights were on all night, all day. Most of the plants are green again, some have just small amount of yellowing on them. So, what I thought was calcium deficiency, really was and now I have calcium toxicity. But I'm happy to see my plants green again, that is a big relief for me. They also grew quite a bit. Now to deal with this new issue, but I'm confident that if I follow the advice here I will be fine.

So thank you everyone for the help. Could not have done it without all of you. No more molasses in the Coco!

Will keep posting updates here.

And thanks Billy and Adjorr for the article/thread!

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glad there doing better, if the problem is resolving itself I wouldn't bother with the spray. And try not to worry, weed will basicly take care of itself as long as it has the right environment

Indoor Sun King said:

how many mg/gallon are you using?

BTW...if it's working for you then don't change a thing

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i add 5ml to a gallon, the calmag isCALiMAGic by general hydroponics.
it says its guaranteed not to burn and to add to every watering.
maybe i will just use calmag every 5th watering or so, i write them all down lol