This is the tap water filter I used to create perfect soft aquarium water for my crystal red shrimps. The only thing you may need to do is to increase GH level after water changing, since the filter lowers both KH and GH level. A proper GH level could help enhance and improve the solidity of CRS's coloration.
Makes perfect deionized aquarium water with organice-removal chamber and color-changing Ion-Exchang resin. One of the most advantage of this tap water filter is that it creates perfect deionized water and easily adjusts pH and water hardness.
" ALL DISSOLVED MINERALS:
Including: Chloride, etc.
ALL HEAVY METALS:
Including: Copper, Zinc, Lead, Iron, Cadmium, Aluminum
Including: Phosphate, Nitrate, Ammonia, Silicate, Nitrite,
CHLORINE and CHLORAMINE
Including: Insecticides, Herbicides, Pesticides, PCBs"