New tank build and needing some help!

I am happy to say that i am finally done moving for a little while, so I have decided to get back into the hobby. I have a 29 gallon biocube, and am trying to do this on a serious budget. If you have any sand, rock, or anything that you are willing to get ride of (or for very cheap), I would really appreicate it! I am looking for rock and sand that has not had any issues though (aptasia, etc), sorry to be so picky. That being said, thanks for reading this post, and I hope I can get this up and running soon!