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hm coul it be lightburn from water drop?
/saw some water drops forming on leafs shes under dome and two 15w leds moved the dome up and there is about half inch gap so those drops evaporated and light burned that tip maybe those white lines were drop edges/
hey buddy, it looks ok to me, think its just the lil hairs growin, no burn or discoloration, id say you are fine, but maybe some else will chime in with an opinion..DJXX
Looks like some kind of fungus. There are similar patches on the wooden stake that's used to hold it up.
That's probably what it's been infected by, because it the white tips don't make it look like regular mildew - which it could still be.
The solution is better airflow, and probably removing the stake and replacing it with something made of plastic. Or give the plant some high P/K late flowering solution (0.2 EC is very safe), because the K will strengthen the stem naturally, and the P will help quickly set up it's root system.