Mollies and plattys

[Fishtankman]

My tank is clear and healthy but I keep losing my Plattys and mollies They only last for a short time why ? Thanks I'n advanced

 

[xtra51]

Where do you get your fish from? How old is your tank? When do you do maintenance?

 

[twoodrough]

following because I have a molly and soon will get a platy

 

[Starka]

Also, what else is in the tank and how big is the tank?