If you really like platies and have soft water, you can buy Rift Lake water conditioner that is mineral salts, and use it at a lower dose rate (about half strength), and it will increase the pH, GH & KH of the water. You would have to add the mineral salts every time you did a water change but it would let you keep them in water that is suited to them.I've managed to catch them all. Not sure I'm doing the right things keeping platies in soft water.