young dying

[panthercz]

Only reason I am thinking it is not the tanks size is that like I said I use 10 gallon tanks with 1.4.... and I haven't had any babies die like this.... and I have 12 - 10 gallon tank set ups! Maybe I am just lucky?

I think you're just lucky!

Seriously though I've always seen litter drop offs in my mice and rats once they start getting crowded. As well as the young that are produced are smaller physically.