The Yellowtail Blue Damselfish is sometimes confused with the Azure Damselfish (Chrysiptera hemicyanea) because they do look very similar. The Chrysiptera hemicyanea has more yellow on its body than the Chrysiptera parasema, which just has the yellow on its tail. This damsel is usually better kept in groups of 3 or more because they can become very territorial if kept singly. This is probably one of the least aggressive of all the damsels, but can still be aggressive nonetheless. Try putting your arm in the tank to perform tank maintenance and you'll see what we're talking about.
The Yellowtail Damselfish is particularly hardy and many hobbyists will use them to cycle a new tank. Using them to cycle your tank is not recommended because it is very cruel to the fish. A better, more humane way to cycle your saltwater tank would be to use live rock. As always, do not keep them with fish large enough to view them as a nice snack.
Yellowtail Blue Damsefishl will go after most fish food including vitamin enriched flake food, frozen, freeze dried and live foods.
Yellowtail Blue Damselfish Profile Facts and Care Information
Scientific Name : Chrysiptera parasema
Common Names : Blue Yellowtail Damselfish, Goldtail Demoiselle
Yellowtailed Blue Damsel Care Level : Easy, good for saltwater beginners, but don't use them to cycle your tank. This is not needed with the use of live rock as the primary biological filter.
Life span : 4 - 6 years, possibly longer
Size : Up to 3 inches (8 cm)
pH : 8.1 - 8.4
Temperature : 75°F - 80°F (24°C - 27°C)
Specific Gravity : 1.020 - 1.025
Carbonate Hardness (dKH) : 8 - 12°
Origin / Habitat : Indo-Pacific
Yellowtail Blue Damselfish Temperament / Behavior : Much like other damsels, this one can be moderately aggressive. Aggression can be lessened or spread out if you have 3 to 7 in your aquarium.
Tank Size : 30 gallon minimum
Compatible Tank Mates : Avoid keeping them in an aquarium with Lionfish, Snappers, Groupers, Triggers, Eels or any other predatory fish large enough to eat them.
Reef Tank Compatible? : They shouldn't bother the corals and/or anemones but can sometimes be little jerks to the other fish in a reef aquarium setup.
Fish Disease : Saltwater Fish Disease - Diagnose, Symptoms and Treatment
Yellowtail Blue Damselfish Diet / Fish Food : Omnivore - try to give them a variety of foods. They will take vitamin enriched flake foods, frozen and definitely live foods.
Tank Region : Middle to bottom
Gender : Difficult to determine