The Yellow Tail Blue Devil fish is commonly referred to as the Blue Devil, Blue Devil Damsel, Sapphire devil, Cornflower Sergeant-major, Cornflower Sergeantmajor, Red Tail Australian Damsel, Sky-blue Damsel, Blue Damsel, Blue Damselfish, and Orangetail Blue Damselfish. The Yellow Tail Blue Devil fish requires a tank with plenty of live rocks and caves to hide when required. When it feels scared, this fish will hide inside a hole or crevice and change its color until it becomes almost completely black. Once it feels safe again, the Yellow Tail Blue Devil fish will rapidly change back into its normal coloration. The Yellow Tail Blue Devil fish is very hardy in nature, which makes it a good choice for any beginner aquarist. The Yellow Tail Blue Devil fish is quite peaceful as a juvenile and becomes territorial and aggressive as it matures. The Yellow Tail Blue Devil fish should be kept in a tank not less than 10 gallons 0r 30 gallons. Be careful, while handling it, as it may bite your finger. The Yellow Tail Blue Devil fish thrives well in a temperature range of 75-82 degrees Fahrenheit and pH of 8.1-8.4. It mainly feeds on an algae, that?s why needs live rocks in the tank that encourages the growth of algae on which it can feed in-between. The Yellow Tail Blue Devil fish is easy to breed in captivity and makes a good addition into any home aquarium.