evolved
Wrasse Nut
So is the bipartitus able to get any food or no? If it's still able to eat and seems to be maintaining it's body weight, I'd be tempted to let things ride for now. You're right; if it was being overly harassed it would simply dive into the sand. It sounds to me they're simply establishing their hierarchy.
Given your future plans, I'd probably considering adding the melanurus alongside the ornate next week, then add the iridis and xmas together at a latter point.
Given your future plans, I'd probably considering adding the melanurus alongside the ornate next week, then add the iridis and xmas together at a latter point.