Hello, I really need some advice and hoping someone here can help me out. I recently stared a 4 bin dwc grow, germed 4 seeds, 3 strains. All of them went into their buckets a little over a week ago and 3 of them have really taken off and look healthy, however the 4th one looks nearly the same as the day it was dropped in (bottom initial leaves have yellowed). The one next to it is same strain and is going strong, all plants in same water hooked to same reservoir. 6.0ph ~500ppm. Why is one lagging? Is there any saving her? I have done soil grows before, however this is my first attempt at a rdwc and would appreciate some advice from someone with more experience. Ill put a few pictures for comparison in a bit.