Nudibranchs are an incredible sea animal that are most suited for a calm environment. They are delicate in appearance, but very durable given the right conditions. Nudibranchs are not reef safe as they graze coral reefs and rock reefs albeit slowly, looking for sponges and other small sessile invertebrates to eat. Usually bright in color, and a clear warning to predators, nudibranchs are not consumed because they store poisonous chemicals in their tissues. Any would be predator instinctively knows to steer clear.