Re-arrange tank, set new territories. I would think it won't matter, but if it does, re-arrange the tank.
if you have a bellus hanging out in a cave, then that fish hasn't adjusted yet to her new home. My experience with bellus is they are always out in open water swimming. They may swim through a cave but these fish don't hang out in caves.
I would watch that fish closely, that is not behavior i would associate with a happy bellus.
Dave b