I'm a noob grower, on only my 3rd grow, but because of the idea of 24/0=more growth. I started seeds on 24/0 and was unimpressed by their growth. After 3 weeks, I switched back to 18/6 and within two days noticed a lot of new growth that has continued since going back to 18/6. I might have accidentally timed the switch during or just before a natural growth spurt, idk, but I do know they are happily growing up into fine young ladies(I hope) now.