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Schroomy
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Myrcene
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Noticed a funny yellowing ting happening to 1 of the Afghan Mass  last week ish. Seen a few rusty spots on leafs  I flushed them and rest about 4/5 days ago and upped my calmag a lil as I thought was going kinda low on it ran out of my usual and the hydro store gave me calnesium today they look alot yellow since yesterday not sure what's causing it ?   I mix 11 litre bucket with 10 ml of calnesium 9ml A 9ml B 3 of pk 13/14  1.1 EC mark ish  pH 5.8 I'm on day 65 starting to show over 3 plants now but the tallest one being the worst others showing on the odd top leafs the critical shows no signs of problems at all had to dim the light to try and get the camera to show it up it can seems to like to adjust colour when it's bright any ideas ? 

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monkeydo
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Alpha-Pinene
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First reaction is light stress especially since the tallest is being affected the most. Raise or dim the light and the damage should stop getting worse. The damaged leaves might not get better but as long as the damage stops getting worse you are good.

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Schroomy
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So today on inspection I'm seeing alot of purple red tinges to the yellowing leafs not sure ? 

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monkeydo
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Alpha-Pinene
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Sounds like your plant is showing “fall colors”. This happens as strains mature in the bloom phase. The amount of color and when it shows depends on the strain and the environmental conditions. If this is what you are seeing it’s natural and nothing to worry about.

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