Just to back up a previous post:
"In the wild Naso spp. are herbivorous as young; accepting more zooplankton with age. As captive unicornfishes become acclimated they greedily take all foods. Meaty types like larger shrimp and euphausiids, worms of all sorts should be supplemented with daily greens."
"These animals range over large areas on steep reefs, picking at attached algae; as adults zooplankton becomes much of their food." - Fenner
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Alan
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