What size tank is it? I have usually had multiple tangs in my tanks, but at the same time, I've also usually had multiple tanks so I could move them around if necessary. In my 210g reef right now, I have 2 YT & 2 Hippo tangs. I find that YTs leave Hippos alone, since they are a different shape & colour. However, I wouldn't recommend multiple tangs in a med. or small tank.
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