Help identify the deficiency

Hi everyone,

Can anyone help me identify the deficiency of this leave. Yellowing starts from the end of the leave toward the beginning with brown spots at the ends. Thank you20200601_102113.jpg
 
It's coco coir and I grow with nutrition of Ferro I was feeding it last 0.8 but I think it was because in the grow room it got quite hot when I was away around 33-34 degrees and it sucked all of the nutrition when I came back home the soil was quite dry
 
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