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I also notice that lower part of the seedling is kinda thin and weak, but it looks thicker and normal pass the medium level. what other factors that slow the roots growth? Light leak to reservoir? Unstable PH? Hard water? not enough light? Can you give any input on what might help roots...

Hi everyone.. I'm new here and hoping that fellow growers can help me. I have seedlings about 3 weeks from seeds in DWC. Tap water; PH approx 5.6; 7ml/gallon Pure Blend Pro Grow; water temp around 70 degree. My question is how do I grow white strong roots instead of thin kinda clear roots...