2. What does coral need to grow besides light
and nutrients

Corals depend on the zooxanthellae (algae) that grow inside of them for oxygen and other things, and since these algae needs sunlight to survive, corals also need sunlight to survive.Sediment and plankton can cloud water, which decreases the amount of sunlight that reaches the zooxanthellae.

Idon't know how to do this but maybe ask your mom or dad