Aquaponic Fish Tank Aquarium for Betta Fish & Gold Fish with Water Garden Planter Top Lid Educational and Fun for the entire family Fish waste feeds the plants; Plant clean the water Includes Ceramic growing substrate (top is removable to feed fish flakes) Ideal for school science projects, classrooms and home school based curriculum This symbiotic relationship between your fish and plants means you no longer have to worry about over/under-watering or fertilizing your plants.