Cabomba is actually a plant, not an animal.
Yes
Yes
a producer there that can't move or eat
No, Cabomba is a partially-submerged plant. It is rooted in soil at the bottom of the pond with its leaves, flowers, fruits on or above the surface of the water.
It has air spaces in its leaves.
Yes! It is completely submerged in water.
Cabomba
No. It can even be rared in a tank or an aquarium!
letting it float
fish could eat as a producer, seaweed, or the small greenery on the side of the water that your fish is in.
A producer can not be a heterotroph. This is because if an organism is a producer it means it makes its own energy and does not eat other organisms.
A rasberry is a producer. Thinks feed on them. That is what a producer is. It isn't a concumer because it doesn't eat anything.