Strange colour

Greenthumbgrower1986

Well-Known Member
Hi all, have 2 fast buds growing at moment on a 20/4 light cycle, both in bio bizz light mix and around day 14 from seed. I've noticed that the plant on left is starting to lighten between leaf veins and the other one is perfect colour. Temps around 25°c lights on and 55%rh with a rotating fan. Any ideas why one is looking like this?
 

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