Yeah the pest strip is the little sticky trap. And the sand blocks the eggs from getting oxygen so they suffocate. Not sure how long to leave the sand there because the roots need O2 also, but that's what is generally recommended so I guess it's all good. Congrats on more sprouting! I'd say you want to have about 4 of those lights for each plant when you flower or you won't get too much, so keep that in mind. Check around in the Indoor & Closet/Cabinet sections, there's lots of people doing basically the same thing as you so you can see what to expect. Knowledge is power, or so it says in Mortal Kombat!