I just did a bayer dip on my rastas for the same reason. Iodine dips didn’t do a thing except make it/them laugh at me. Did a 15 minute dip in bayer and I think I got the last laugh! I saw what looked like 2 dead worms at the bottom of the container.I am desperately seeking a solution for my spionid worm issue as well. I’m convinced they are irritating my zoas and not allowing them to fully open. I’ve scoured the net and no one has any reliable solutions. Please update this thread if you come up with anything.