Many kudos to you and your setup...looks great! The plant looks overall healthy, some yellowing but really nothing major if you can correct the N, and it looks like it's getting pretty tall so good job. From one newb to another I have to admit you're a bigger man than I by going with the ebb and flow over soil for your first grow. However I'm really surprised out of all the people posting I've yet to see anyone offer an opinion in regards to your plant's sex. I've read what seems like a hundred thousand posts, articles, books, and blogs and from the hundreds of pictures I've seen I hate to say it but your plant is exhibiting a lot of male qualities. Males are often tall with sporadic branching and few leaves. You're using a nice lamp so I'm pretty positive it's getting PLENTY of light, so unless you've been pruning a lot it really doesn't have a lot of leaves for it's size. Females are generally bushier than that. You said it's bagseed but do you know the strain? I really do hope I'm wrong because I hate being the bearer of ANY bad news, but my experience with my own grow and research is telling me otherwise. Best of luck all the less.
BTW, what do you mean by "going to clone to find out sex to be 100% sure"?