sooo im re doing my 55 gallon. i have one angelfish and some cories its an amazon biotope. ph 6.8 temp is 78 and has live amazon plants and driftwood. when im done i will have poss 3 angelfish, 2 bolivian rams and a school of hatchetfish. was wanting to add some freshwater type shrimp. any suggestions on what type would go well??? are there even amazon shrimp???