is absorbed by duckweed, 35% protein, that floats on the water
surface, does not contribute oqygen and can be a complete food
for tilapia. Best to grow in separate shallow tanks.
Algea are tiny aquatic plants that live on sunlight
and waste-nutrients, contribute oxygen to the water and are filtered
by tilapia for food.
Biofiltration habitats with rock and plant-root
surfaces and air for bacteria that convert ammonia to nitrate
Settled sludge waste that sinks to the pond bottom
is removed and vermicomposted.*