How do aquatic plants eat fish?

Plants act as great filtration, provide the water with oxygen, absorb carbon dioxide created by tank inhabitants, combat algae growth and provide shelter for your fish to hide in.

They provide shelter for fish but they eat fish? Are these plants the big ones that look like corals?

Related to corals and jellies, fish-eating anemones are typically found in the cool waters of the eastern Pacific Ocean attached to rocks or pilings. Their genus name Urticina derives from the Latin word for a stinging plant called a nettle. The species name piscivora means fish eating.