The activity in these wrasses causes them to be a bad move in smaller tanks.
Many assume this, the reason they’re less suitable it due to their name of “Flasher” Wrasses. This is given to them because of their displaying. When a Paracheilinus species displays the male will make quick, exaggerated moves whilst showing some extravagant colours that aren’t seen in the resting colours. The quick moves can be a risk in a tank less than 4’ due to them potentially running into rocks and other things such as coral.
When we compare this to Fairy Wrasses of the Genus Cirrhilabrus, there is a much more obvious difference. Yes the same behaviour is shown however the display doesn’t happen as often in captivity and when it does it isn’t in short spurts and instead the fish can swim round (yes at some speed) and be weary of when they may potentially swim into something.
Also, a Fairy Wrasse may not display when kept alone and instead may display when kept with similar bodied fairy wrasses or if a flasher wrasse was to display.