Okay I am worried that i have a ticking time bomb on my hands. I have a 29 gallon tank. I had nine females in this tank, but the older and more aggressive females have killed the weak females ( in their eyes) I am now down to 5 females who are all fairly aggressive. In the past when i lost 3 females i re-added three more females at the same time. All but one survived from the trio. The only fish they tolerate, aside from themselves, is a female sword tail ( they HATE other female fish but she is twice their size, so they don't mess with her) a red tetra and a male rainbow who has crushes on my female bettas,and four cory cats. I have read on here or somewhere else that you have to have more than 9 females to a 29 gallon or it could be unstable ( with the other females bullying the female lowest on the totem-pole) I had to take out a female who was showing signs of sickness, so i got her all better and i saved another from a cup, who was near death. She survived as well. But i am worried that if i reintroduce my old female and add the newest one that they would be get slaughtered because now their hierarchy is now messed up. Is this a ticking time bomb, any minute about to explode or is this somewhat stable enough to be okay, but to keep an eye on? And yes my tank is heavily planted.