If you see this little guy at the LFS, please don't buy it impulsively. It is commonly known as a Purple Nudibranch, and its only food is a specific type of sponge. Even if you happen to have the right sponge growing in your tank, it won't be enough to keep this beautiful creature alive more...
The Purple Sea Slug, Hypselodoris bullocki, is a natural predators that are not necessarily reef safe. They feature a gorgeous sleek purple body with white outlines and orange antennas. They can be great members of a clean-up crew as they can sometimes eat algae. If threatened, they can release...