Amano, red cherry and bee are about the same in terms of difficulty. Cherries are very adaptable in terms of water hardness, ph and temperature but prefer slightly alkaline water ph 7.2 but they do fine in harder water or slightly acidic water ph above 6.5. They breed like guppies when they are happy. Bee shrimp are the same species as crystal red, the crs are just a colour morph of bee shrimp. CRS tend to be regarded as the most difficult I think that is because of the amount of selective breeding to get good red and white colours. Higher grade CRS like A and the S grade are probably more delicate than the ones available in UK mostly grade C. Bumblebee shrimp are a different species havent kept them. Tiger shrimp prefer soft water like the CRS. Nitrite, ammonia and copper (in meds, food or plant ferts) are the biggest shrimp killers. A very well cycled tank is a must. I have crs, cherries and amanos haven’t found crs as difficult as I expected they are doing fine in a five gallon tank. Ph 6.8 kh4 temp 21C.