My sohal had a soft spot for very expensive and exotic sponges. Reduced a 7X3 inch bright blue sponge colony to confetti in 3 days.
I think sohals have a taste for things that other tangs might not find palatble in general.
I was lucky in that once my sohal was removed I had literally hundreds of small colonies of that blue sponge start growing on all my rocks from the bits that got scraped off - but you're not going to be so lucky with that urchin.
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