The Redtail I was talking about is Xanthichthys ringens or the sargassum triggerfish. Was this the trigger that the OP was refferring to?
I can't imagine a Redtail/Sargassum trigger in a 65, they are pelagic fish and really need swimming room. LA/DD sells a lot of these and they suggest 125 minimum. LA is fairly realistic, for a dealer, on tank-size recommendations. I have a Redtail in a 240 (8" long) and he covers the full length of the tank in a second.