What's really going on here?

[juicy jay]

I just switched to well water and it's possible it may be hi in iron, most plants look great except for a few of the finicky strains. All help much appreciated from this noob.. Oh using sensi soil which is an organic super soil mixed with sunshine 4 at a 50/50 ratio.

 

[Dog Star]

If you have poluted water source than in the end of ciclus your plants will be totaly
toxic,change water source if you can,or use reverse osmosis filter.

Leafs get necrosis and if its not some funghal issue than your water is not good,
healthy leafes usually dont die from good water.

Did you gived this water to analysis if you think water is issue for problems??

 

[juicy jay]

oh dang forgot to mention im filtering with a hydro logic tall boy before filling my rez, ill get better at this folks i promise haha

 

[juicy jay]

literally every plant is thriving except this strain..

 

[LostTribe]

whats your ph? looks like burn to me...

 

[juicy jay]

it has been around 6. been raising it up to 6.5 now and added some cal mag based on what i read on another post, seems to have helped.

 

[Ratzilla]

To help ID certain problems sometimes its not only what going on with the leaf but where on the plant the affected leaf is.
The difference is when on the bottom it is a mobile element where when its new growth , on top it is a immobile element.
Mobile elements are N, P, K, Mg and Zn.
Immobile elements are calcium, boron, chlorine, cobalt, copper, iron, manganese, molybdenum, silicone and sulfur.
Then you could have damage from bad cultural practices which a ph. imbalance is only but one.
If the leaves pictured are from the bottom and appear dark bluish at first my guess would be a phosphorus deficiency.
Ratz