Well I'd recommend them depending on: what other livestock you have, tank size is important for a harem and whether you'll be able to feed them enough. They're supposed to be hardy and are mid-water planktivores. The fellow we have was out swimming and eating probably 15min after purchase. I think the most important thing, besides the health of the potential fish, are the other fish in your tank. I don't think the flasher or fairy wrasses would like a lot of competition from other similar fish. We either have Cirrhilabrus filamentosus, a fairy wrasse or else Paracheilinus filamentosus, a flasher wrasse. Identifying is tough as both these fish have a long dorsal fin. I originally wanted to do a harem but gave up when I thought the chances of seeing more than a scattered few that no one would be able to sex.