which ones? The spinata are hard to come by from reliable sources. I have imported them a few times and have a captive population but am not selling them. The sulawesi shrimp in general are very challenging to keep. In an ideal tank environment, y ou would have a high oxygen content, sand, some rock work, maybe a few low light plants and temps of abotu 82-84. You would want your pH around 8-8.4 and a low hardness, around 6. These parameters are very difficult to duplicate so it can make getting an established colony difficult. There is also the point that they can cost $10-20 PER shrimp, so its a big gamble.
If you are experienced with keeping dwarf shrimp, definitely give them a try. If you are relatively new to the invert scene, I would recommend starting with a less challenging species. There are lots of common mistakes made when keepign dwarf shrimp and such a rare and delicate species is not a good one to learn on.