I currently have four flasher wrasses, a Paracheilinus angulatus sub male, a Paracheilinus lineopunctatus male, and a sub male and female Paracheilinus filamentosus. I know that the sub males may or may not flash, but I figured that the lineopunctatus would flash the others at least. Has anyone experienced this? The group is going through it's second round of prazipro and the angulatus is the only new member of the group, with the other three being inthe system for three months. They are in with a pair of Pseudojuloides cerasinus and one of each of Macropharyngodon bipartite and Macropharyngodon geoffroyi. I also have two black clowns. None of the other wrasses or clowns bother them. They eat with gusto and have been healthy since day one being in the tank. Am I overlooking something that is causing them not to flash? Thank you in advance.