A bird cage will not work because the wires can harm the gerbils. Also, they can kick all the bedding out and make a giant mess. They also will not have enough space.
One of the best type of cages is a fish tank or aquarium. These provide safe environments for the gerbils, they cannot kick out the bedding and they are best for viewing the gerbils as well. A 20 gallon is the best size for 2 gerbils, but the more space you can give them to play or run around the bettter. So if you can get a 30 or 40 gallon then go for it!
A glass cabinet requires some DIY, but it is a great alternative for a gerbil cage. They are in general huge and very cheap to get . Especially second hand.
If you are going to get gerbils, you might want to buy a second cage to keep the gerbils safe while cleaning out their main cage.
Video taken from Erin’s Ark
Gerbil Hub is our website about our gerbils. We have a whole bunch of them and we love them. They are fun to watch, play with and very easy to keep. Contact us for information. We are located in Redding, CT.