Glossodoris sedna
Many Chromodorids feed on sponges, and as with other sea slugs, they are often found sitting on top of their favorite prey species. Many of these nudibranchs specialize in only one species of sponge. Finicky eating habits like these are what make keeping nudibranchs in aquaria often so difficult. Sometimes it is a challenge just to figure out what the critters want to eat, let alone keeping a supply of prey alive and well in the tank. So, it is much better to leave the animals in peace and enjoy looking at them while scuba diving.
Getting back to the sponges that these guys eat. Sponges secrete toxic chemical which are abosrbed by the dorids and stored in the mantle glands on their backs so as to repel potential predators.
