I am in my senior year and I have had fish since my first.
2006: 5g with tetras
2007: 5g and 29g community
2008: 5g, 29g, and 55g CA/SA cichlids, a P. senegalus, and an eel
2009: 5g, 29g, 55g, and another 55g with a breeding pair of salvinis. also a 10g with local SW fish and a number of guppy & swordtail bowls.
Two of my roommates also have 10g community tanks. Oddly enough, the 29g was the only one I bought. All of the others were gifts/free.
Technically we are only allowed to have tanks 20g or smaller, but nobody has given me a problem about it. Plus, I'm a marine biology major so it's sort-of related to my curriculum. Just make sure you're on the first floor! (to be safe)