I have just purchased 2 Sakura shrimp to add to join my betta and apple snail in my planted 5 gallon. It has been a few days and one of them is missing. The other one is getting alone fine. My betta(female) doesn't even seem to notice the other one and it isn't hiding in the plants or filter. Just tore the tank apart looking for it. Only place left for it is the substrate or my apple snails belly. Already searched the floor as well.