I disagree, the fact that thats ALL they eat means they die when its food source is gone unless you can remove it and pass it on. Ill stick with the shrimp. Nothing against the Nudis, this is just what works for me, ymmv. I direct feed mine daily so he's well fed. Id be willing to sacrifice an occasional feather duster or whatever to keep the Aipasia population in check... I have none... I only have one Pep in a 60 gallon, I can defnately see where a gang of them could be problematic.