I would very much doubt your brittlestar will enlarge its hole. Generally they seem happy just to have a hole at all.
Mine live in my green star polyps, in the eggcrate holding my skimmer up, under my return pump, in my live rock, etc.
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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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