The debate between 24/0 and 18/6 is a never ending one. Its more personal preferance. I personally go with 18/6 because ive read a few articles that support the belief that roots grow faster in the dark. Plus Im growing this poor plant to cull it once I've pampered it its whole life then stressed it out in its last few weeks of life. Least i can do is let the thing sleep for 6 hours a day while its growing ^^.