Two possibilities flame angel or starfish. It happened over night so I'm leaning strongly toward starfish. My flame stays busy all day snacking at algae.
lfs called it Cortez star. My research says its pentaceraster cumingi. No aquarium site I have found has them. the other names i found is cumings star and panamic cushion star. It's been a real pain in my ass.
ok we'll that oart wasn't eaten just the polyps. I woke up yesterday and the main cluster of polyps weren't there. I tested everything and my water is fine. Could my new powerhead cause them to stay in?