I don't recommend anything but aquariums for gerbils, but they won't be any less happy in something like that. If the cage has a wire or mesh bottom, they won't be very comfortable though.
Zoey: Bombay Cat - 1 1/2 years old
Pepper: Calico Cat - 1 1/2 years old
Penelopé: Agouti Gerbil - R.I.P. Lived to be 3 1/2 Years old
Nala: Argentine Cream Gerbil - 6 mos. old
Zelda: Siamese Gerbil - 6 Months old
Nana: Agouti Gerbil - 3 Months old
Link: Siamese Gerbil - 6 Months old