McCosker's Flasher Wrasse is a friendly species that can be kept with most friendly species in a community reef aquarium. It should not be kept with large wrasses or aggressive fish. You can keep a harem of McCosker's Flasher Wrasse in the same tank, but you should only keep one male in each tank unless the aquarium is very big. You should also avoid males of other flasher wrasse species.If you want to keep a McCosker's Flasher Wrasse harem in your aquarium you should introduce all of them into the tank at the same time. If this is not possible, you should introduce the females before the male. Once the females are introduced you will have to introduce the male within a limited amount of time or the dominant female may turn into a male.McCosker's Flasher Wrasse feeds on zoo plankton in the wild and needs to be provided small food in the aquarium. They are relatively easy to feed and can be fed a diet consisting of frozen food such as brine shrimp and daphnia as well as finely chopped shrimp, crab meat and mussels. Feed 3-4 times per day.
