We just got a blue hippo tang 2 days ago and it was supposed to be a small one, but I think it is more on the tiny side (approximately 1 inch). Since we got her, she has hid in the live rock and she won't come out. She came out a couple times the first day, but has since hidden in the rock. Is this normal for a new tang? Should we be concerned that she is sick? Any input will be GREATLY appreciated!