If concentrated Prawn poo-poo and water is considered an organic pollutant then this should do the trick….

Ultrathin Covalent Organic Framework Anchored on Graphene for Enhanced Organic Pollutant Removal.

Just target the poo-poo profile…which can only be a factor of inputs and metabolism.

https://onlinelibrary.wiley.com/doi/10.1002/anie.202206564

There is a bacteria for everything on this planet…even bio-remediation in the prawn RAS…

https://english.elpais.com/science-tech/2022-05-10/scientists-discover-a-new-fuel-eating-bacterium-below-car-tank-lids.html

Scoby for prawn – living filtration membranes demonstrate antibiofouling properties…

https://pubs.acs.org/doi/10.1021/acsestwater.1c00169#