Yes, this nudi does eat Aiptasia and nothing else. However, many people that try to use them to rid their tanks of anemones have poor success. One of the biggest mistakes is adding them to a tank with predators. Wrasses, some angels, and many shrimp or even hermit crabs pose a threat. People also add just a few to a tank and expect them to eat all of the anemones which generally doesn't happen. Once the anemone population is pretty sparse the slugs starve to death and you need to step in and finish the job.
Dr. Kempf, the guy that first figured out how to breed these things, offered a good solution to get around this problem. Before you get the slugs, take a few heavily infested rocks from the main tank and put them in a smaller separate tank where you can actually breed the anemones by feeding heavily and occasionally cutting the larger specimens. When the slugs arrive, toss them in there and after a short time they should start breeding. After you have a small army of them, add them all back to the main tank at once. This helps increase competition between the slugs and gives you a better chance of them actually eating all of the anemones before they all starve to death.
Thank you so much!
