Question about pups

[Janet Morrow]

The pups are doing well!  They are eating seeds and Fruit and Fiber cereal, which all the gerbils love.  All three pups have their eyes open now.  They are extremely friendly and love attention.   They are now nineteen days old, and are nursing on a regular basis.  >From what I have read the pups should be weaned and ready to go to their own tank between four and five weeks old.  Is this correct?  I want to keep them for one to two weeks after they have been weaned to be sure that they are ready to be adopted.  (I have a separate tank set up for the tree of them.)  To clarify, I do not intend to separate them this week.  I know that they are too young.  My main question is should they be placed in their own tank at four or five weeks?    Janet & Liz