I got gerbils!!!

[Charlie Blum]

I just got gerbils!!!! I have them both in a 20 gallon tank and they are so cute! one is agouti pied and the other one is black! thier names are Lucky and steve ( after my cat which is also the one that lisa paleczny gave me I re-named it steve) One is a boy and one a girl I am going to breed them any advice u have 4 me?