This YouTube video by the California Academy of Sciences takes you in the tropical waters of the Phillipines in an animation that seems reallife, link. 

This quiz by Encounter Edu, an award winning digital resource maker, tests your knowledge on corals, link.  Click on "Start" and read the clues before touching the screen where you think the coral is in the image. 

see this website for inspiration, link

Instead of using twizzlers, and adding the dots with a pen, have the students always use things that you can buy at the supermarket including sprinkles instead of pen markings.