I've never liked the idea of a huge aquarium, so I use these:
They are much cheaper at Target - about half as much as Crate and Barrel charges.
You can fit up to 8 of these underneath the 4-ft lights, and depending on the size of your plants, you can put anywhere from 1 to 5 plants in each. It also makes it easy to move plants that require dormancy, a shorter photoperiod, or whatever. It also helps with other issues - I can mist my heliamphoras without my Pings getting peeved. [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img]
God must have an interesting sense of humor
I use a fish bowl and it fits up to four small plants in it. I got mine in the (strangely) arts and crafts section of Wal-Mart(a.k.a. Wallyworld [img]http://www.**********.com/iB_html/non-cgi/emoticons/tounge.gif[/img] ).
My plants are going green to save the environment