Shrimp

[BC_Grl]

*Edited*
We have been looking at acquiring shrimp (hopefully a M/F pair). What I am having a hard time is figuring out the differences between:
* Scarlet Cleaner Shrimp (lysmata debelius)
* Scarlet Skunk Cleaner (lysmata amboinensis)
* Cleaner Shrimp (lysmata grabhami)

These 3 sounds so much the same from a couple of articles I've been reading -except the Scarlet Cleaner is the smaller of the 3. Is it really based upon price? I added the latin terms as some we've talked to call all of them "cleaner" shrimp- but which one?
Thanks.