Hi John,
I've had all of those shrimp species before at one point or another. They are all usually imported from India under various names (including "rainbow" shrimp). The green and the red shrimp (next to the last picture) are the same species. This species is very interesting and I had a colony of them going strong until this summer when a big disaster hit all of my shrimp colonies....
Anyway, they are usually green, but a very different green from the "green shrimp" that we already know. I have a few pictures of these guys lying around and I'll see if I can find any. So, normally they are green, but they *can* change their color when they want to camouflage and turn red. However, they can also turn red when they don't feel that well.
The blackish and the orangish shrimp might actually be the same species, too, especially if they have very small eggs. These guys usually come as "by-catches" and never in really large numbers.
The problem with these species is that some of them might actually interbreed. I have some reason to believe that after seeing some very unusual looking offspring after keeping all of these shrimp together for a while. The only problem about trying to separate them out by species is that the males of most of these species almost look the same...i.e. they are see-through. The best way to separate the species is to speparate out the ovigerous females and hope that the right male fertilized her.
Anyway, good luck with them and try to get as many colonies established as you can.
