Fighting!!AAAA!!!!

[Kim Molsberry]

Hello,
I boy i sold some gerbils to is having a big problem!! His to brother
gerbils are fighting!! Ones eye is hurt and ones tail and rump and back
is a little cute up!!
Please help!! I  feel horrible!! what can I or he do to help them get
along. The last gerbils I gave him killed each other!!*sigh* I don't
want that to happen this time!!
Help
Kim and Gerbils!!