I take out my plastic shelves and replace them with wooden ones,
http://www.hamstercentral.com/forum/...hp?f=25&t=5106, they're really expensive to buy (which I don't understand they're only wood?) but I've found an e-bay shop which sells all sorts of different sized shelves, thought I would let you know I think they're really good value
http://cgi.ebay.co.uk/ws/eBayISAPI.d...2BSI%26otn%3D4