im thinking about getting about 4, do they clean the bottom of the tank? iv just changed 2 sand and i never sppreciated how much mess is made from everything, whats people views on them???
Nothing will eat FW fish poop except the bacteria that will eventually break it down. You just have to siphon vacuum the poop out. I understand there is a SW fish that eats poop though.
Amano shrimp are good scavengers (as mentioned, they don't eat waste though) and will also eat algae. They really don't add anything to the bio-load either.