you can make shells out of chocolate. buy the molds and there are different kind of shells.. ac moore, michaels, hobby lobby, etc have the molds.. my sister's wedding cake had them on it
I have used the chocolate shell molds and pressed fondant into them. You could also mix some white and milk chocolate once you pour it into the mold to get the swirly effect. You could use isomalt for the coral.
I would make the fish/creatures out of modeling chocolate. The coral could be done with royal icing or gumpaste.
This is my Nemo cake....
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1604189
I made the characters out of RKT, covered in fondant.
Chocolate shells made with molds and painted
the little purple things are just fondant
Isomalt coral
I think that's all. HTH!
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