I've tried to keep gold apple snails with discus but the snails died after about a month in the warm water. When they die they putrefy very quickly, so you need to remove any dead ones right away. I keep little Malaysian trumpet snails with discus, and the snails do very well. I think they need some gravel to burrow in, since they only come out at night. I have a thin layer of gravel in the tank. I think these snails are livebearing, and they have multiplied a lot in my tank.