That's copperband butterfly, not coral banded, which is actually a shrimp. 
I think most people here would discourage you from purchasing a difficult fish like a copperband just for aiptasia. Try what Alan, Deb, or Bob said, or see if you can get Berghia Verrucicornis, a nudibranch reported to eat Aiptasia spp. anemones.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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