Can you post;
Your set up - Size, Filtration system, Heat(of water, and basking spot)/heating, lighting (basking and UV..?) Decor, plants and anything else you may be using
Also what you are feeding and anything you have treated the water with
Basically all the details you can think of posting about how these guys are set up. First issue is to stop replacing the ones you have lost. You are essentially putting new additions in an environment with an issue you have yet to resolve. Second
one is really all you should keep, depending on the size of the tank, or until you can get these issues sorted otherwise you risk loosing all of them. Until you can give us your setup there is little else to recommend
