Welcome to Canreef.
Interesting behaviour for a tang. I have nothing to offer you on that note.
There is a great diversity of invertebrates in the hobby, many sold without ever being properly identified. I am sure there are some type of urchin that will start black and develop striping as they mature. Possibly Echinothrix calamaris? Check out http://www.wetwebmedia.com/urchins.htm.
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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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