multiple sea urchins

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[btrue]

I have a long spine sea urchin , and would like to get a few more different kinds of sea urchins. The internet says that they are peaceful, but will they live together in a 29 gallon aquarium?

[Rico]

Not sure about mixing, but it should be okay.  I would use a bit of caution with these guys.  While they are often purchased to control hair algae, they also can get quite large, up to 8".  That would be a bit much in a 29.  They also can be bulldozers in the tank, rearranging rock and corals as they feed.  The smaller tuxedo and pincusion urchins may work better.  All of them will eat your corraline algae as well.

Rick

[Robert M.]

I have 4 urchins together without problems. One is a black long spine, one is a pincushion and two came from Florida which are probably pincushion as well. The pincushions can easily move anything as big as themselves that is not glued down.