I recently had an outbreak of nudibraches in my tank. If you notice my signature that was my tank. Now 90% of the zoas are gone, and about half of those are in this 15 gal. I had so many baby nudis on my zoas, so bad, it looked like ants on food, BAD. I have been fighting these things for ever but there were too many to twizz off. I started reading some old posts and find a guy who promised that a 30sec hot water dip with ro and shaking the zoas after for one minute after in the hot water would rid them all. So I went for it. IT WORKS!!!! About 90 degrees and 30 seconds and swished them for 1 minute, and almost all are dead. I have tweezed a few medium ones. But its much easier to get them in a 15gal. All have opened or are starting to open. Some did die but was worth it.