Katina and Gergesa live in a basic 10 gallon glass aquarium, which is an acceptable minimum-sized cage for two gerbils; I much prefer tanks over wire cages for gerbils, who kick bedding around constantly, making a big mess in a wire cage!
The wire top I made myself out of wire; the wire spacings are too large for mice (5/8" x 5/8"), but fine for the gerbils.
The gerbils eat a basic hamster seed mix; the "gerbil" mix sold by my local pet shop has way too many sunflower seeds! Sunflower seeds are fattening and should only be fed sparingly.
They also get rodent lab block, as well as "treats" like rice krispies and small pieces of bread.
Gerbils are very active and playful, and Katina and Gergesa are no exception. Gerbils enjoy toys that they can climb on, climb into, dig underneath, and chew! Plastic, store-bought toys, often expensive, are quickly destroyed; better alternatives are store-bought wooden toys, or other harder-to-destroy toys (they'll still be destroyed, it will just take longer) are less expensive; better yet are free toys from around the house, like small boxes, cardboard tubes, disposable plastic containers, empty jars and coffee cans, that sort of thing.
Katina and Gergesa have a variety of toys which they use with gusto! They periodically rearrange them in the cage and work diligently at destroying them.
