I did buy the Berghia and they did start out very well and with in a week cleaned off on soft ball size rock. However it seemed that either they went on strike, were eaten or just plain died, I have only seen one since I first added them( 3 nudies) 3 months ago.
However I have had tremendous luck with the addition of a Copperband, he is an aptiasia eating machine. So I do think the Nudi's would work in small environment with out big current or predators, the copperband would be my first choice. FWIW....... I tried Joe's juice, vinegar, Kalk paste and peppermint shrimp and to be honest none of them are nowhere near as effective as the copperband. To give the peppermint shrimp a fair shake....I also have a large camel shrimp and he REALLY likes peppermint shrimp for a snack.....so my peppermints really never got a chance to show there stuff. To date I have not caught that dirty little camel shrimp, but on bright note....my Mystery wrasse has nailed him on several occasions and it is only a matter of time before he is lunch...LOL The Copperband has been a model citizen in my 120 and I do have a few softies, zoos and tube worms and he pays them no attention.
Geo