Strange Behavier?

stress!!! I just had the same problem with my tang and a butterfly fish yesterday. The tang uses it's tail to cut the other fish til it dies. I took my tang out and the butterfly already seems better minus the cuts all over him. Someone said if you rearrange the rock they won't recognize it and will back off and other people say if you take the tang out for 2 weeks it will back off when reintroduced. That all depends if you have a seperate tank. I put my tang in a ziploc and it died in a matter of hours before I could get it to it's new home. Some people say to let them be and see if they back off, but I wouldn't risk it.

Reefer Ron said:

I have just added a Chevron Tang to my 125g Reef, Fish, LR, & LS tank. My exsisting Sailfin Tang is backing up rather rapidly at the Chevron? Can anyone tell me if I should not stress? I starting to change colors! LOL

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It sounds like you are having a problem with aggression between them. MonoSebaelover cautioned you on possible aggression with your Tangs in this thread.

http://www.aquariacentral.com/forums/showthread.php?t=39266