RIP! lost my female perc.

[The Guy]

Found my female percula on the bottom with her stomach cavity open< I've noticed lately she seemed to have a very fat and full looking stomach.
Could she have been egg bound? She ate well and seemed normal even up to yesterday. Now the male is on his own, should I get another to replace her now or wait awhile, I heard they can reject a new partner if there introduced too quick.