On Prawn species adulteration – unfortunately it is anti-biotics from Asia topping the list…

https://ift.onlinelibrary.wiley.com/doi/10.1111/1541-4337.12998

ShrimpLab exposé – the Alien Crab Prawn bottom cleaner – wet wipes used initially also – 2010

2010 tests – 500w range 20 metre diameter tanks. 24/7.
2020 tests – Brushed filter skirt – airlift support.