There are a couple of options. One is a kole tang. It eats film algae so you have to leave one side of the tank dirty.
The other is the scopus tang. It eats macro algae and other green foods.
Reefwars the problem with buying a small tang with the intent that a reefer will upgrade soon is that despite best intentions things get in the way; financial, divorce, kids etc.
I agree with doch, I could never part with a tang once I had it for a few years. I could with a wrasse and many other fish but not a tang. They, like clownfish tend to get personalities.
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