+1...wrasses especially...once their 'internal' clock is set, even turning the lights on early doesn't wake them! :eek1:I have had similar "issues" with fish. Lights on a timer set the fish's biological clock and new fish take a while to adjust their biological clock to your time. Especially relevant with fish recently arrived from a radically different time zone.
I think wrasses just like to turn in early.
I had a yellow "coris" wrasse that was up at opposite lighting hours when I first got him. He was probably "jet-lagged" from being exported from overseas. It took a few months for him to gradually adjust to my lighting schedule.