how to make the head of the crs redder?

[Crystal Red Shrimp]

how to make the head of the crs redder?

[Xmant]

You can't make the head redder. If the color of the head is the same color as body, then that's meant your crs is healthy. If you can see the different, pay more attention to your CRS, may be your water conifition is not good.

[silane]

I think he meant coverage of reddness, some shrimps when looked carefully into, appear as dotted. Yes, like you said they cannot be make to look fully, they are basically genes related, water condition does affect a bit.