Problem with my single gerbil

[Mike Dolan]

Hi, I used to have to gerbils living in the same tank, a father and son, the
father passed away tosay and I know that gerbils cannot be left alone. So, i
also have to other tanks with gerbils. One tank has two male and a female and
the other has three females. I just am clueless on what to do with this poor
thing and I would appreciate any responses. Thank You