How much room does a hamster need?
Also question is, is a 10 gallon tank big enough for a hamster?
10 gallon hamster tank But a 10 gallon tank for hamster of any breed is I'm afraid going to be too small in most cases. Some hamsters are very sedentary or shy, but most like to explore, play and run around. A hamster 10 gallon tank simply doesn't give them enough area to do so.
Also, what is the minimum floor space for a hamster?
Cage specifications For Syrian hamsters, the National Hamster Council recommends a minimum usable floor space of 1000 cm2 (394 in2). For dwarf hamsters their minimal recommendation is 800 cm2 of usable floor space and 17 cm high. Hamsters prefer larger cages and want much more than the minimum.
Rather than shelling hundreds of dollars for such a cage, you might try converting an old aquarium into Fluffy's new habitat. If you have a master escape artist, tanks are also pretty safe -- as long as you don't give the hamster a chance to climb on something to reach the top of the tank.