Hi I have 6 fast and vast autos under 600hps bulb, 4ftx4ftx6ft tent with 6 inch fan and filter. They are on 18/6 light, ppm around 1100 and ph around 6. They are 6 weeks old and been on bloom nutes for 2.5 weeks. All was well until 2 ago when I noticed them not being so green. Do you think it's a deficiency/too much of something? Any tips greatly appreciated many thanks
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