Thanks to Larry who came over last night and helped me out. So they were red planaria flatworms. So far I have only seen them on the end of my red tunicate encrusted in blue zoos. Attached is a pic of it when it was healthy. We removed the piece from the tank and put it in a small container with tank water. We removed as many flatworms that we could and then performed a 10 second RO water dip. I container of RO was filled with flatworms. We performed another RO dip after letting some time go by and this time there were not as many but still a lot of flatworms that came off. On the third RO dip no additional flatworms came off and the piece went back into the main tank. So far (knock on wood) I can’t see any more flatworms in the tank.

The zoos were susceptible to the flatworms because my branching hammer had grown over to the zoos and were stinging them. The only zoos that had the flatworms on them were the ones in contact with the hammer. The hammer did not, as far as I can tell, have any flatworms on it.

I will keep this thread updated on the success or failure of the treatment.

Larry thanks again.