I'm having issues with my guppies. Initially I had girls and boys in the same tank (recipe for disaster, right?!) and separated them after a month. All my girls (apart from my albino one) were pregnant and only one has had a successful birth, the other four have all died whilst still heavily pregnant with a red patch by the birthing hole. Levels have always looked fine - Low levels of nitrite and 0 for the others. Am I doing something wrong? The one that died today had been visibly pregnant for about two months 
