No do nut cut any bottom leave off till you have a few internodes of growth. You need to find the site of your infection and use some thing like neem oil, or Azamax. Bot of the pestidices are 100% organic and work on everything...at least the Azamax does. As well they are foiliar(taken up through the stomata in the leaves) , and systemic (taken up through the roots and embedded in the plant). Keep your lights close, and keep some wind on them..IMO the seedling look over fertilized as hell! 30-10-10 at 100% strength is entirely too much! Remember the manufacturer suggest that you always give 100% strength. which is ALWAYS too much. When using new nutrients and new genetics ALWAYS start out with a diluted 25% solution for the first week or two...then move up gradually. I bought some dutchmaster gold a couple years ago for a DWC grow. Dont get me wrong powerful ass shit. But going from 25-50-75-100% strength over a month period absolutely killed the plants by over fertilization. The next session i went 2 weeks at 25% 2 weeks at 50% and then the last 2 weeks at 75%. My plants grew bigger, stronger, faster, and yielded more than double the time before. Over 4 grows i never once used 100% strength...I hope this helps!
Peace,
StickeeGreens