100 gallons
a powder blue tang is a saltwater fish, it is also known as a powder blue surgeon fish. if you have seen Finding Nemo, this fish is the same thing as Dori. Actually dori is called a hippo or blue tang, and is not at all the same as a powder blue tang.
Algae
The blue tang, either Pacific (Regal), Atlantic, or Powder, do help the environment by consuming algae.
The blue tang is a saltwater fish that is very easy to care for, even for the novice aquarist. It requires a temperature of between 72 and 82 degrees, a minimum tank size of 100 gallons for one fish, and eats a herbivorous diet in the wild.
Powder blue tang is a popular aquarium fish but they can be difficult to breed. Breeding takes place when the female scatters her eggs throughout the water and the male comes in behind her to fertilize them.
None of the tangs commonly called Blue Tang - Powder Blue, Atlantic Blue, and Regal/Hippo/Blue(Paracanthurus hepatus - are on the endangered species list. So the answer is never.
Regal tangs get about 12" long.
Dory is a Blue Tang fish.See Related Links below for a real blue tang fish.
The Blue Tang changes colors as it matures.
The Tang invented gun powder and fireworks. >_<
tang is soluble because it can dessolve in the water
The Blue Tang does not migrate. It lives on the reefs and eats algae.