Change the filter either to an HOB(and cover the inlet with a mosquito net) or a corner filter, so that your shrimp-lets doesn't got sucked.
Now coming out to the color aspect-
1. White or Yellow colored substrate doesn't belong out the best of the color its not true, the issue with a black substrate is that is the contrast. I have kept crs in bare bottom tanks where they look as good as in ADA.
2. To improve or get more red out of your rcs do or look after certain things -
-such as varied diets with algae wafers, ada or mosura pellets.
-introducing shrimps from some other source reason due to excessive in breeding the existing line looses its color and also become fragile.
- use a 65000k light which helps in improving the color intensity ( This i did for my crs to improve the red and white and it worked so can be tried on rcs too)
-Maintain the temperature around 25c, it will help improving the coloration.
-Remove out any potential predators ( the galaxy's) it will help the shrimps settle down quickly and will show their best.
- Removing or feeding out the not so colored-bright off springs, this helps in maintaining the color.
These are some of the points which crossed my mind, will update soon if I remember anything else
Hope this will help!!!
