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hey I've got a problem I dont know if it from the lights or a calcium deficiency/ mag deficiency. There are brown spots that look like there dying, really dry. But the temp is arouns 28C and the humidity 40-50%. 2 plants in 3weeks of veg, 4 cfl lights 3600 lumen per light and are 2 inches away...

I need help I'm new to this. I'm using a bubbleponics 6 plant set up but only growing 2 white widows, ph is at a 5.75, 12.5 ml floragrow, 12.5 ml floramicro, 5 ml florabloom in 5 gal tank using distilled water in the 5 gal jugs. They are 3 weeks in veg, humidity is about 40-50% and temp is...