Give three examples of biofilters in an RAS.

biofilters require sufficient oxygen (generally about 5 g oxygen per gram of ammonia oxidized and at minimum concentrations of 3 mg/L) to function properly. Oxygen will become limiting in a biofilter as a result of saturation oxygen concentration, the concentration of organic substances in the water, hope this helps

Explanation:

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.