everything
their unusual colors and forms(shapes)
Usually 72 - 76 degrees F, but most corals prefer different temps, when answering this question it depends on if it is soft corals or hard corals, but this is the average temp
Yes there are lots of different types of reef corral, there are table corals, stags horn corals, brain corals, fire corals to name but a very few.
Torch corals are generally green, brown, or golden/orange in color.
Corals are not plants. They are the colonies of dead creatures called polyps. Their skeletons stack to make coral reefs.
There are many types of decor one can put in a tropical aquarium. One can put in different arrangements and colors of plants. Once can also put in castles, corals, and a variety of ornaments.
bright or dull colors....colors may vary form gray to bright yellow
I dont know all of them but i know 2Spines - have venom in them to protect the fish from bigger marine life.Coloured Stripes - can come in different colors of black, white, pink, orange, and red. There different colors help them camouflage.
Absolutely, there are many hundreds of different species of crabs that live on coral reefs. Many of them have close associations with the corals, such as the Acropora crabs, which live in between the branches of Acropora corals, and eat the slime that the corals produce.
soft corals live deeper water than hard corals because soft corals do not create a hard outer skeleton as the hard corals do.
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no, current did not have different colors