On the first attempt they floated back up tp the top because the fish are really loving them. This wasn't good so I decided to make a device that makes them sink and stay in place. I took some sandwhich bags and added some of the stones that I had to them about 5 or so and then I tied a knot just at the bottom of the plant. From there I knew that the plants were going to need water so I poked several wholes in the bottom with a sewing pin and placed them in a corner of the tank. It really has worked and made me happy as well as the fish. If you try it please let me know. God Bless!