2.2. Cleaning ability experiment Twenty grammes of a 2 mmcommercial sinking pelleted feed were added to each tank (n=5), after 20 min all the remaining pellets were removed by syphon.
2.2. Cleaning ability experimentTwenty grammes of a 2 mmcommercial sinking pelleted feed wereadded to each tank (n=5), after 20 min all the remaining pellets were removed by syphon.