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My ph is 5.9 hps at .70 metre and the soil is semi wet.

Hi people this is my first post and I'm also new to growing. I've been growing for 2 weeks now and I'm on my second day of veg and I gotta ugly problem that came up on the leafs. Can anyone tell me what it is and how do I fix it? At the moment they just getting pH water and under 600 watts hps...