Yeah, my friend Matt had some urchins (tuxedoes & other spp) & they would eat through 3-4 bunches of my excess macro in a day or two. Watch out though because urchins will knock over anything loose as they wander about your tank. Can't you just pull out the macroalgae by hand? I harvest mine regularly & usually sell several bunches a week.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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