yellowing and browning on leaves

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thecalm007

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10 gallon dwc 4 plant system with square plastic pots i put holes 1inch rockwool cubes with hydroton and cardboard covering up hydroton...1 1000w hps with 3 cfls and 1 t12....gh 3pt flora series (lucas feeding schedule) and superthrive..it's been 3 weeks 5days from seed and the plants are one in the middle 8inches ( i think because it gets the most aeration) the oother 3 are 3.5 to 7 inches....the spots are a lighter green on one with yellowing leaves at bottom and some are getting brown spots...i think it is a mag def. but would really like to here others thoughts....just did my first res change yesterday and just foliar fed with epson salt today....would really like to know wht you think any info a help
 
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