how large is your tank. Unless you have a 200+ gallon tank you will not be able to house a naso long term. You might be ok with a hippo short term but they also get quite large. Yellow tangs are known jerks and if you can i'd suggest taking him out for a week before you add the new fish than add them all at once. Rearanging rock work when you add the new fish will also fulfull teh same purpose.
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