can buy ghost shrimp! they're pretty. And you dun even know they are there unless you look hard enough. It's fun to try detect each and everyone of them in your tank everyday you come back from work. have a bout 10 in my 10g tank... everyday spend about 5 mins just to get all 10 of them. Plus they are cheap! can get about 20-30 for RM1. Get those small size one, cause these guys are aggresive, if they dominant in size... they can hunt anything.

p/s: They go nice with glass cat fish...(i think)