[Delphinus]

My pair of C. ulietensis ("double saddle-back" or "false falcula") butterflies DESTROYED the majano problem in my 110.

Problem is they like anything with long little tentacles. So zoanthids for example seem untouched. But palys on the other hand, are in a contant state of "trimmed" (the polyp itself is fine, but no tentacles coming off them.)

And LPS is a problem because of the feeder tentacles. So since LPS tend to feed at night and butterflies tend to, you know, sleep, at night .. it's a very slow rate of decay with them, but now that I've had the butterflies 2 months I've had to relocate all my LPS into my smaller tank.

I don't see any LPS in your tank though so you might be OK. Just that one patch of palys there to the left? .. Mine have shown no interest in the clams so you should be OK there.

...

Something interesting I learned though. The whole legend about Chaetodon ulietensis for majano control was begat out of an article written by Terry Siegel in Advanced Aquarist a number of years ago. Going back and re-reading that article and looking at his tank pictures, he has mis-ID'd his fish, what he in fact has is Chaetodon falcula.

From a few conversations I'd have with folks on RC, C. falcula is slightly more reef safe than C. ulietensis. Also in the last year of looking for ulietensis, I passed on falcula a number of times because I was holding out for ulientensis, because the article was adamant that it was ulietensis. (It was only after I had the fish already that the mis-ID was shown to me..) So falcula may be better in a reef, and may be easier to obtain (could just be luck of the draw though). Both are spectacularly beautiful butterflies (very subtle differences in markings, in the falculas the black are smaller defined triangles, where in ulietensis it's more gradual).