I'm starting my first reef tank and I've been super extra cautious with everything. I cycled my DT and QT for three months before bringing home my first fish yesterday, a Midas blenny. He was eating and happy looking in qt. After I turned the lights off he seemed stress so I left a hall light on for him, and when I went to check on him he was all spotted and still at the bottom of the tank. I panicked thinking I killed my first sw fish and oh why did I try this? Turns out he was sleeping woke right up and changed back to normal. Silly blenny, sleeping in terrifying manner.