yes the ingredient all they can eat, but not too much fresh for gerbil, so don't over ya.
everyone hv difference definition loh. some ppl think no bite = tamed, some ppl think sit in ur palm = tamed, some think take food from your hand  tamed.

gerbils are activef fela, so don't expect they sit on ur palm loh. if the gerbil know you, when they are outside the tank, they shouldn't go hide. they will run around u.