StringerBell wrote:

How much nutritional value is there in green hair algae? If a tank had a
generous amount, could a small Yellow or Hippo Tang live off it for a week
without added food?

Until recently, I had a Powder Blue tang. It wouldn't touch hair algae. It did
pick at the green algae that grows on the glass.

George Patterson
Those who do not study History are doomed to repeat it. Those who DO
study History are doomed to watch every one else repeat it.