PK1
Supporter
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if the light is not intensive at the back than leave it be. However, you can do a super cropping which will bend the branch but won't break it. this is just to help those long branches that are under the heat of the light. If you have a smart phone you can download a ppfd app. for iphone i use photone. not my app or an sponsor. These things aren't accurate but it gives an idea of what the numbers are at, but again with the setting you have at 18" with 90% it could be fine and it could be that the picture is just taken with too much light.
The pictures in the dark show the leaves perfectly and you have a happy plant but then the flowers are all frost white
The pictures in the dark show the leaves perfectly and you have a happy plant but then the flowers are all frost white