Yellowing leaves with "purple" spots?

[ZioFrancolino]

Some older leaves are getting yellow and other yellowing starting from the tip, I've given light N doses though, maybe overfert/salts buildup? I'm not worried though, the plant is good overall
Soil: biobizz light mix
Nutes: Biobizz Grow

 

[Joint Monster]

What is the coldest the temperature gets?

What's your pH?

It does look like a typical N deficiency. Purple could be temperature.

 

[ZioFrancolino]

What is the coldest the temperature gets?

What's your pH?

It does look like a typical N deficiency. Purple could be temperature.

17-18 °C
I don't measure pH, I'm going to buy a phmeter soon, how much should I spend?

 

[Joint Monster]

17-18 °C
I don't measure pH, I'm going to buy a phmeter soon, how much should I spend?

The purpling could be the temp and genetics? Or it may be the start of another deficiency, possible magnesium?

You need a pH meter, otherwise you will be guessing what nutrients your plant needs. Adding more will not help.

If you want something to last you a life-time, maybe $100, Blue Labs or Hannah Brands.

If you want something cheaper, $20-50 you can get some cheap pens on Mr.'s Bezo's Giant Bookstore with 1 day delivery.

 

[ZioFrancolino]

The purpling could be the temp and genetics? Or it may be the start of another deficiency, possible magnesium?

You need a pH meter, otherwise you will be guessing what nutrients your plant needs. Adding more will not help.

If you want something to last you a life-time, maybe $100, Blue Labs or Hannah Brands.

If you want something cheaper, $20-50 you can get some cheap pens on Mr.'s Bezo's Giant Bookstore with 1 day delivery.

Strain Is zombie kush which can purple but I wanted to be sure it was not a deficiency of some kind

 

[Joint Monster]

Strain Is zombie kush which can purple but I wanted to be sure it was not a deficiency of some kind

Then a pH meter will be your best option.