Please help my fellow R.I.U gardeners!

i have been getting these weird leaves for around 2-3 weeks tryd cal/mag to see if it was a cal/mag deficiency but still getting them on older leaves starts of as a few lil brown dots then goes like this and crispy.
1.1 ec made up of canna A+B + cal/mag
ph 5.8
temp flicks around 70-80f

plant looks healthy (apart from the leafs with that) and is growing fast and nicely ????

could the ec be too low got told around this stage should be at 1.4 ec?????

over 100+ views and no help??

I meant to respond earlier and forgot, srry.
I think you might have the start of a P deficiency. P deficiencies usually start to show at the end of the leaves where they turn grey and brittle. I pulled the below info from one of the many marijuana problem solver sites.
GS

Figure 12 shows Phosphorus (P) deficiency during vegatative growth. Many people mistaken this for a fungus, but look for the damage to occur near the end of leave, and leaves the color dull greyish with a very brittle texture.
View attachment 2064940

how long has this been happening? plants look fine to be honest, a little brown spot on a leaf is no reason to get all nuts.

@godslave- i think mine is dif to that bud it starts of a orangey brown and goes brown and dry but only on the one big leaf in the middle :/
@matthebrute - been happening around 2 weeks mostly on older growth i bumped it up to 1.4 ec today to see if this helps. just annoying to see it one day all nice and green then next day loads of brown bits its happening on my other plant aswell.

Ahhh hell, if it's only a leaf here and there on older growth, I agree with matt, don't worry yourself so much.
GS

oright i would say around 8-10 leafs are like this. mayb i am just being over paranoid. my old dear always use to say ''you will understand wen u have kids why i get so worried'' ever since i got these lil babys i understand what she was on about

phosphorus....alkaline, wet, cold? any of the above?

no.....this is real; not paranoia. it must be addressed imo. it can lead to leaf-drop and stunting.

oww we meet again oright i dont really understand ''

• phosphorus....alkaline, wet, cold? any of the above?​

  
  
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Right so problem is much worse around 20 brown tips and no one has any way of solving this ??

phosphorus doesn't like the cold....it doesn't like alkalinity, and it doesn't like wet soil. it doesn't travel well in those conditions.

purple stems......bronzing, crisping.....been there. reverse any of above-mentioned conditions if one or more do indeed exist.

It is never too cold in there 70f lowest. This might sound dumb but what does alkalinity mean? I'm doin it hydro no soil.

Stems are normal green mate

not in pic they weren't. and i was thinkin' soil. looks like phosphorus def./lock-out in first pic.

I see what you mean now a few redish purple stems in there so how would I go about this?

either they are not getting enough, or it can't get in. review nutes.

I had the ec at 1.4 lastnight just seen its now 1.1 should I put it up to 1.5 for the size of the plant is pretty big?