Nah, you don't have to worry about those lower leaves. Pretty soon, they'll become blocked more and more, and there's not really much you can do about it. They look nice and healthy though, excellent work.
That reminds me what it's like to start from seed, rather than cloning. They look so much nicer when they're small, that I can't wait til mine take off. I germinated some Ice seeds yesterday,(22 hours. holy crap
) put them in soil today, and expect them to start poking up through, tomorrow morning. Sweet. Hmm...maybe I'll start a journal this time. *scratches chin*lol