Question....

[KittyGurl]

I think hamsters, mice and gerbils can be kept in a tanks. I would get a 25 gallon tank so they could have more room (if you are planning to get a hamster.) The mice and gerbils would be okay in the 10 gallon.

[Hellow]

I keep Little Bit in a 10 Gallon aquarium and he does fine. but he lives by hiself
so that may change things, plus when you only keep one gerbil you have to socialize with them very often which i can do because i only have Reggie as my other pet.