Is there anything I could/should have done to relieve the stress my royal gramma apparently was going through. She had established a cave as hers. She has been in the aquarium almost from the beginning. Lately the cleaner shrimp has been hanging out near her cave. She didn't seem happy about this. She started to stay in the cave more and more. The last couple of days she was in there almost exclusively. She did not appear sick. I have not seen her for 24 hours and am afraid she is gone. Question: should I have re-arranged the rocks or done anything else to try to make her "happy"?