New shrimp

[Varanus]

They have sexes, the main way to tell a female is that when mature they often have a dark mass in their body (developing eggs). As for coloring, they tend to darken as they acclimate to a new environment (getting pale when stressed), though color can also change with age/over time.

[cspina]

Thank you very much. so the goal is RED shrimp. If they are turning colors than they are happy shrimp. good to know.

[Varanus]

They also can naturally change color as they grow and age.

[crittersni]

The advice to place it near a window is good, but only for indirect (shaded light). You do not want it in direct sunlight, as that may overheat the water.

Read (and reread) the how to set up a tank info on this website, especially since you've been doing it and it's not all new and overwhelming anymore. You'll likely pick up some tips that you may have missed the first time around.

I'm glad your shrimp are adjusting well.