I saw some of these swimming in the plants section of my LFS and they said they use them to keep algae down. I haven't got an algae problem since I covered the one end of the tank that gets sun on it but I liked them and asked if they're suitable for temperate tanks; mine is at 73 - 75 F. They said yes. I then asked them if my fish were likely to eat them and they said no. Since I've had some seriously odd advice from LFS' already I'd like to ask here as well. I've got 12 White Clouds and 6 Peppered Cories - will they make lunch of an Amano Shrimp?