what other type of Tang for my 150

[Myka]

Four tangs in a 150 seems like plenty already to me...besides you already have an Achilles, so what more would you want?

Personally, the hype of the Black Tang...I don't get it. They're only expensive because they are rarely imported due to being scarce in the wild. Why people would want a fish like that is beyond me. I say leave them in the ocean then!