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I should have double qouted, second half was for the Op regarding the info I thought you relay in your post. ;o) 70 degrees is ok. You are on the borderline of lower air solubility and a higher change of bacteria forming. the higher you go the higher those risk become.

Keep us posted. Very common misconception.

Being a peat based media, and your watering PH, you probably sunk your medias PH down to 3. NOT GOOD. Also get in there and prune that thing, remove plant material and it will need less nutrients to support itself. This will help with the deficiency. Did you add any lime to it? most mixed...

They look nice. Brown tips are not only nutrient burn. That ppm don't sound that high for the size of the plants. That's around 1.0 EC depending on the meter/scale that's used. (500/700) What's your heat/humidity like? heat at the canopy?

Looks like root aphids.

Both for sure. Peat based medias need to be amended with lime to buffer the low 3.5ish PH it has.

Could be a PH fluctuation although thats more like a curving down, or lack of oxyagen possibly? What kind of media are you using? Are they all the same strain and media?

Because what you are mixing is a good mix for them. But too light for your big plants. up the EC a bit upto 2.0. All around micro and potassium deficient maybe?

I'm pretty sure they call for every watering don't they?? Also if you're throwing nutrients at it to correct the problem and nothing happens, it could mean a ph issue. slightly out of range, giving the deficiency. Is that grow media peat based?? Lime should be added to prevent the from slowly...

Peat has a Ph of 3.5 - 4 I believe, so any peat based medium needs to be amended to buffer up the PH. They never add enough, that would cut into profits and hinder you from buying their lime products. ;o) Lime is best used. Some use oyster shells, but I don't have experience with them. I...

micro deficiency? judging by the medium and nutrient combo. Zinc or manganese? The one on the right is nut burned/heat stressed.

I have experienced dyed roots from certain fertilizers. Some use beet juice in them. That water temp is not ideal and you have to do something with your PH. way too high and you are experiencing potassium deficiency by the looks of it, possibly from the PH. What are you feeding it? what type...

When a single branch is affected, it could signal a root zone problem for sure. If you have 60 plants. Toss it.

Over watered, not enough nitrogen. Probably short on many nutrients.

I'd say bump up that EC to 1.0 or 1.2, inching upto 1.5. The plant is a good size. most likely under fed. DWC is a high feeding/quick growing method. They grow quick and demand higher nutrient levels. 1 EC is 500 or 700 depending on the common scale used in your equipment. .88 is low for that...

Did you pre charge the coco with a cal mag solution? I heard you need extra mag in coco.

Iron?

I agree with the phosphorous. Possibly low PH in the soil or not enough in the mix. Peat based mediums need lime amended into them to buffer up the 3.5 PH of the peat moss. Check run off ppm and ph. 6.8 is a bit high for watering ph. Especially if the soil medium PH is really low, the big ph...

Potassium and magnesium, most likely due to the PH drifting too high and reducing the uptake. Also too high calcuim:mag ratio isn't ideal. your product is 4:1 2:1 is more ideal