So I have a 10 gallon tank that I started about 3 weeks ago, I filtered the tank for a week with no fish and I added bacteria supplements that would speed along the process and make the tank fish friendly (for that entire week and proper amount following the instructions). I added my guppies about 2 weeks ago, 3 females and 2 males. A male died the first night I assumed it was just the two males fought for dominance and 1 died. 3 days later, two of my females gave birth to around 20 fry. Then this morning one of the females who gave birth died, and the another one as I watched grimly died. I noticed that both the females who died (the two that gave birth) their bodies were whitish all the way around the stomach area. The other females tale when I saw her this morning was completely shredded and the male is acting berserk and swimming frantically (all day). Everything is testing fine nitrate 0, nitrite 0, ammonia 0 and the tank mechanically filtered, no live planets. The fry from what I can tell are healthy and I have been doing 25% water changes every 2 days. I'm not to sure whats killing my guppies and the remaining female looks sick and I really don't want her to die. For anyone concerned about the fry's, I am currently cycling a 5 gallon just for them and they all are in case in a mesh net in the tank.