not wanting to sound like the "tang police"....but.....depending on the size of your tank one tang is probably enough...tangs need a lot of swimming space and have quite an attitude at times..especially with other similar fish...plus in the right conditions they can grow quite large..
powder blue is one of the more difficult to get to live long term. Kole is a better choice, albeit not as pretty. Rabbit fish are great fish as well and there are several types commonly available now.
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