I am so sorry mate but you definitely will not get away with it - usually some form of cleaner comes in every week or so (unless you're living in a house outside campus, in which case you'll have to contend with the landlord), and in any case you'll probably be surprised by how busy you are!
I can't imagine adding the routine of keeping another creature alive while at uni when I barely remember to feed myself, and I think many people would agree!