i veg using the 24/0 schedule, it works for me and almost everything i've read says that's the way to go. although, i have read that there are diminishing returns and that leaving them on more than 18 hours per doesn't yield an appreciable difference. i don't know if that's true or not so, which ever schedule you decide on, stick with it, you don't want to confuse the plant with sporadic lighting.
also, your plant is still a seedling so it needs very little light, when you see the third set of leaves start to come out, add a light, another blue one, not the red one, and go to lowes or homedepot and get some 40watters, or even 30's, 18watts and you'll need 10 of them (and wouldn't it be better to have 10 x 40 watts rather than 10 x 18?)
during veg, you want mostly blue light, if you add that red one, you'll have 18 in blue and 25 in red, not the right ratio

anyway, good luck

bozo,
peace, love, dope