In the pond tank you will see a lot of algae and waater plants. They cover the entire surface of the tank. There are a few hanging tubs inside the tank which hold larger plants growing in dirt or water. These are places that insects can enjoy. The water is almost clear but it is also brown. Frogs love this pond ecosystem. When the frogs are sleeping they look dead - they just float with their arms and legs outstretched.
Kid Pix of a Pond Habitat and Animal and Plants Defined

Ponds are small bodies of water.
They are not very deep, so sunlight reaches the bottom. They have
muddy and sandy, usually mucky bottoms. This helps water plants
and algae grow. Fish and other water animals and organism feed on
the plants and algae. Sometimes ponds turn green in the summer if
they are covered in algae. Ponds can dry up in the summer and freeze in
the winter. Ponds were formed in various ways - by glaciers, by streams,
by springs and rivers, or by people. Ponds have vegetation growing
around them.
Worms, fiddler crabs, frogs, snails
and small fish live in ponds.