Rock shrimp?

[Teejay87]

I had one rock shrimp to start and he was almost all bright red, I added a new rock shrimp that was a light color with a stripe down its back about 4-5 days ago and they hid. As usual but now they came out and look identical. Does anyone have any explanation?

 

[Samphotog]

Stress can cause color changes. Improper feeding. Fighting. Lots of stuff