I know I can physically remove them, or trap them, but is there any kind of passive way to remove them? It almost seems like there are enough snails to actually cover the substrate in my tank. This is in my office so unfortunately I cant devote too much time to physical removal but I would like to thin the herd if possible. Are there any fish that eat them? Would also prefer not to get assassin snails because then I'll have a ton of those afterward.