[I have had three Yellow tangs for a year and a half. They chase each other around every ones and awhile with no harm until last night. When I awoke this morning one was missing. I looked around and found it hiding in its home. The other two will not let it out. If he tries to come out the chase him back. The poor guy or gal is petrified. I tried chasing the other two away but I can't stay on them 24 / 7. I can't catch them so does anyone have any ideas. I fear if this keeps up I will soon have only two tangs]