How long would you let 2 tangs fight for?

[corpusse]

The Achilles is beating the Naso, not the other way around. My chevron died due to an eating injury. He ate a small clam and it closed on him. Other then some initial slashing he got along with Achilles.

I am well aware they are not from the reef but the surge zone. He is however not going to get ich. Ich is not present in my tank. The Achilles was in QT for 100 days prior to his introduction. The Naso was in QT almost as long. Both went through prazi for flukes and copper for ich for a full 30 days at full dosage then additional observation time before being added to the display. While there is a small chance some could come in a coral I am working at qting everything for 72 days including snails and frags this is primarily due to the fact I have an Achilles tang. Should he ever get ich from a frag the first thing I will do when a single spot appears on him is drain the tank and remove all fish for 72 days.