Okay, at first I thought maybe they were "scratching" because of ich. But paying closer attention, I noticed that they were taking turns are "hosting" the green star polyps. The one with the dorsal fins laying down will spend about 30 seconds at a time in the GSP like so... Then not ten seconds after this one left, the other one would come in and do the same thing, but not as long. Is there any reason why this one would have the dorsal fins erect? I don't think they are breeding since I believe they are still too young, roughly 5 months or so. But they will rest in the GSP and I've never noticed it before.