I have two gerbils–two males from the same litter. They’ve never fought nastily. That’s probably more of an issue when introducing two gerbils who’ve never met before. It’s best to get a couple, because they’re happier that way, apparently. I know ours groom each other, sleep together, and cheerfully fight over the occasional cashew we give them. I’ve been bitten a couple times, but nothing that drew blood. More of a nip that says “Hey, crazy human! I’m done being handled here!” I think if you take your time getting them used to you and eating out of your hand, you’ll be ok. Just approach the cage every day and make the same noise, and then sit your hand in with some treat like a piece of fruit or cheese, and gradually they’ll realize that you’re not going to eat them.
They’re very self sufficient creatures, and as long as you clean out their cage every month or so, vaccuum around it every couple days, make sure they have food, water, clean bedding, and a place to dig, and let them out to run around (in a closed area–the bathtub works well for ours) every couple weeks, they’re happy. When we got ours, I bought a small $5 book on gerbil care and behavior from the pet store, and it helped explain things.
Cages: Don’t get plastic. They will shred it. They chew constantly, and move their burrows around here and there all the time. We got an aquarium and a wire cage topper, and ours are happy as clams. We fill the aquarium with chinchilla sand, kitty litter, and recycled newspaper bedding. We put fresh sand and some hypoallergenic wood shavings in every week or so between cleaning so it doesn’t smell. They also use sand baths, like chichillas. But, well, they do smell like rodents, and they do kick stuff out of their cage. I mean, they’re living creatures. They gotta go. Not nearly as messy as an untrained uncaged animal, though, I imagine. They bury their pee and poop–after they go, they automatically scratch with their front paws to cover it up, even if they’re just sitting on plastic. Its kind of cute. They also dig like crazy. All the time. And it’s pretty fun watching them recreate their burrows after you clean out their cage, and watching how quickly they shred paper towel rolls.
Warning: Be careful of gerbil tails, which are very tender. If you tug on them, the skin can come off, and if the tail is injured severely, the gerbil will knaw its own tail off. I’ve never seen this, but the book I bought mentioned that. shudder
I enjoy watching them and picking them up and giving them a good scritch and a piece of a grape now and then. They look up at you with this tiny insane rodent face, which is really the closest thing to affection you’re going to get. They’re like a far more entertaining ant farm that you can pet.