expert with unidentified signs of a plant problem needed

Owais

Member
so i got a white widow, 1 week old, it's growing healthy and looks good to me, maybe a little younger than it's supposed to be but the problem that i can't identify what it is, a black spot on the new baby set of leaves, it looks like a rot to me! can anyone help me with identifying it please
Ph 5.7-5.8, EC 0.26, water temperature 24C and and yesterday someone told me it should be somewhere around 19C so I'm trying my best to get it down to 19 by adding ice to the reservoir, room temperature fluctuates from 82F to 75F but mostly it's around 75-79, and it's under 150watts of metal halide about 23inches away vertically, and 3 cfl's, 2 23watts and one 32watts, i noticed that the black spots on the small leaves got worse today than yesterday, first pic was taken yesterday, 2nd pic just captured it now

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