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i would definetly steer away from yellow and purple tangs. they are quite agressive especially if you ever want to add more fish in the future for any reason. there are many horror stories on these gusy killing other fish. I honestly dont have any suggestions for you as most tangs do get huge. We have a naso in our 180 and he hasnt grown in years. bigger but not huge. Naso tangs are quite peaceful, but if you go with one make sure you get about a 4 inch minimum smaller ones dont tend to make it
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