Help! Why do leaves curl at the tip?

Image by ceresgreentech
Water from the fish tanks is filtered through a series of stacked rock beds to aerate the water before it enters the growbeds.

Photo: BOJUN CHISWELL

Question by Becca L: Help! Why do leaves curl at the tip?
Does anyone know why baby/young leaves curl in an aquaponics system? Or just curl in general??

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