If you think that's bad, I have a hamster book that says 10 US Gallons is okay for 4 adult dwarf hamsters!
Europeans have higher recommendations, of course. One dutch site says 15 US Gallons for 1 or 2 gerbils, 30 US Gallons for 4 to 8 gerbils. Another dutch site says 15 US Gallons for 1 to 2 gerbils, and an extra 5 US Gallons per extra gerbil. In Austria, a tank for gerbils has to be 50 US Gallons minimum by law. And Germany recommends 65 US Gallons.
Last edited by genevie; 09-14-2011 at 02:08 PM.