I have a pincushion urchin I've had for probably 6-8 months when I had a terrible hair algae problem. Well algae gone.... And he needs food. I've been feeding him seaweed for a few weeks.
Is seaweed enough for him or do I need to get rid of him?
They will eat coraline too, at least mine does. He will also eat seaweed and ulva lettuce. I got one for the same reason, most my GHA is gone to but he is constantly on the move and keeping it that way.
