I have to agree that shrimp quite intrigueing to watch at the moment i have 2 mountain shrimp or wood shrimp or bamboo shrimp i noticed there are a lot of different names for them, im in the process of settin up my 28 gallon tank and im definatley considering investing in some red cherry shrimp as they are nicley coloured, i think they make the tank look more interesting.
I could sit and watch mine for hours as they scurry up and down the tank and even when they are not doing much just sat with their fans out catching bits of food.
my tank used to get a little bit dirty from the leftovers as my cory's were'nt doing their job properly lol, but i noticed when i introduced my shrimp to the tank it started gettin cleaner they are definatley i wise investment i'd say.