Octos and fish generally don't work well together. Fish tend to bother the octo - we've even had reports of damsels going after the octo's eyes. They can also make your octo stay in hiding more. When your octo grows larger, the fish can become a meal. Of course, there are exceptions, but more people have trouble with the combination than not.
Also, avoid the urchin with sharp spines. You don't want any injury to your octopus. The pencil urchin is fine.
Nancy
Also, avoid the urchin with sharp spines. You don't want any injury to your octopus. The pencil urchin is fine.
Nancy