What liquid fertilizer would be suitable for transplanting my dahlias from seed into into 4 inch pots to help them develop properly? Right now my seedlings are about 2-3 inches tall. After transplanting they will continue to grow under lights in my cool basement. I will be using Promix as the transplanting medium. Would either Schultz 10 15 10 or Miracle Gro 4 12 4 or Plant Prod 5 15 5 be okay? If so, should I mix as suggested or reduce the amount of concentrate? Any suggestions appreciated.