hardier and less aggressive tang

I dont have any experience with a blue tangs or mimic tangs but I had a yellow in my 85 that pretty much harassed my diamond goby and foxface lo non stop, just my experience
 
55 gallon is too small for any of those 3 tangs. The only tang that might be okay in a 55 might be a kole tang.
 
I have a yellow and its fine. They can be dirty but keep up on testing the water and water changes and you should be ok. Try to get one smaller than your other fish though.
 
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