Simplify the following text for a Grade 14 native English-speaking person.
Original: Although corals can catch small fish and animals such as plankton using stinging cells on their tentacles , most corals obtain the majority of their energy and nutrients from photosynthetic unicellular algae called zooxanthellae .
Simplified: Howwever , most corals get most of their energy and nutrients from photosynthetic unicellular algae called zooxanthellae .