You could actually use the fishtank for a hydroponic setup. Lights depend on how much you are willing to spend and how big of a place you want to grow in. You will also need to read up on growing before you start to.

http://www.1stmarijuanagrowerspage.c...oponics-3.html

That site shows a way to make a simple hydro setup. You can just make the appropriate changes for the fishtank. Also there are tons of sites online that help with everything. Good luck.