My ph is 5.8 im using boibizz grow and haven. Everything was going ok until leaf started to go yellow and now brow spots.
Looks very close to a magnesium deficiency caused by low ph. cant seem to direct link, but just refresh this link once it loads http://www.growweedeasy.com/magnesium-deficiency-cannabis
To confirm the guy above take a photo of the main stem and a leaf stem on the top most branch If it's purple it very well could be mag
I also believe it to be magnesium defiency you need to maintain you ph level because if it is at what you say it is your plant will not get as much nitrogen, phospherous, and mag, as it needs (in soil at least which is what you appear to be using)
5.8 is good f9r hydro..soil needs to be 6 to 7.. Nute burn will show up as yellow on your leaf tips..which is what I'm dealing with..gave a low low dose but I think I was too early..
You got mag def so epsom will help this in turn will cause phos def but if ya soil it shoukd be 6.5-6.8
Now like 2wks later the ph is 6.5 with nut and 6.8 with water the drip. That leaf is now purple. There is growth but not 100% correct leaf are skininy. I purchsed biobizz fish mix and An conasur. With one is a better idea to use?
what kind of light are you using? How far apart from leaves What the temperature in there? Too hot or cold also cause stem to turn purple. Now it Sound like a light burn to me. Check out the leaf of light burn. Edges Appear Brown or Burnt ? Yes <div class="field-item even">Pale Color Leaves ? Yes Yellowing Between Veins? Yes Veins of Leaves Stay Green ? Can't see Brown or Dark Spots ? Yes Leaf Symptoms: <div class="field-item odd">Upper Leaves / Newer Growth Affected : yes Leaf Edges Appear Burnt : yes Leaf Tips Appear Burnt : yes Leaf Tips Die : yes Yellowing Between Veins :yes Veins of Leaves Stay Green : yes Spots : yes Leaves Curl Upwards : can't see Wilting / drooping : yes strong nutrient solution is splashed onto the leaves under hot HID lamps, may cause the leaves to burn under the solution Too </div></div>