“Dirty” prawn water in RAS…..brown or nutrient rich sounds better.

Bit of a negative connotation for marketing here.

Adding a brown water conditioning treatment in return water for exclusionary purposes and controlling RAS microbiome development is a preventative measure.

Same as green water conditioning prior to returning water.

Either can be used in RAS.

Clean water chemistry for returning water in a biological aqua-culture system not a viable option. Better to add in controlled, target species, target system biological conditioner.