A biofilter is any device for carrying out biofiltration - a technique for pollution control using living material to capture and degrade process pollutants.

Yes, absolitely

A bioswale is a type of biofilter designed to remove silt and pollution from surface runoff, consisting of a swaled drainage course with gently sloped sides and filled with vegetation.

i believe you mean copepods they are very very small almost microscopic usually in the sea and in almost every freshwater aquarium they are good and help with both biofilter and they help feed fry being so small. They are a crustestian the best place is wiki.com just type "copepods" there only defense is to swim away and they can swim super fast. their really facinating little creatures but sometimes you want to be careful as they can carry tapeworms or other illnesses if brought from the wild which is rare in home aquariums but more likely in outdoor ponds.

Terry Thorogood is a pseudonym used by science fiction author Isaac Asimov for his book "Murder at the ABA". It was published in 1976 and is a mystery novel set in the world of science fiction writers.