Bottom leaves yellowing?

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Problem: bottom leaves yellowing and getting slightly dried out. At first I thought it was light burm maybe. But raised light and there getting worse. New growth and upper leafs are looking OK and looking at photos of other deficiencys I can't tell what it is.

Medium/grow method: biobizz lightmix

Feed: and supplements used: top dressed with half recommend dose of grow from livingsoils(UK local based company) it is 4-6-4 npk.

water source: tap water left to stand for atleazt 24 hours. Ph to between 6.2 and 6.5

Strain/age: RQS quick one. Start of week 4

light used: Marshydro ts1000

Climate: did get hot last week reaching low 30s. But other then that between 23 and 28.

Additional info: my first grow
20200824_213502.jpg

20200824_213506.jpg
 
Looks like magnesium problem but I would like to see the whole plant.
 
They look over-all ok. I would add a little P-K boost and 1/4 tsp of Epsom salt to your next fertigation.

:vibe:
 
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