Is it normal that leaves start to sagging down after light switched off?

bellis

New Member
I got 2 hydroponics. They both feeding from the same reservoir, and they both growing well. But one of the plant start sagging straight after the light is switched off. When the light is back on, the plant also recovers. Is it normal?
Or am I doing something wrong?
thanks for advice

Here's the picture

leaves_sagging.JPG
 
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