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For them to produce offspring, yes, you need male and female urchins for that. They may spawn even without another urchin in the tank though.Don’t I need another to release eggs?
Huh?NSFW
Even if you had multiple and proper food for the larvae, the young would likely not survive in your aquarium - most aquariums are not larvae-safe for a number of reasons.I don’t want 10,000 urchins so better just have the 1

