What is wrong with her......

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temps stay between 68 and 78.....%RH 50 - 60.......about 4 weeks into flower....using latewood recipe ( 0 - 1 - 2 )..... ph between 5.5 and 6......ppm around 850.......water is poland spring with initial ph of 6.8 and ppm of 35......using a single 150hps......single plant hydro grow in hydroton.....strain is mango......WTF is it ???

Did some research and thinking it's black mold, nute burn or phos def.....any ideas......PLEASE HELP!!!!!!!!!!
fireman25 Reviewed by fireman25 on . Please tell me I can fix this...... What is wrong with her...... Rating: 5