The middle of the night is the middle of the day for my fish since I'm nocturnal.
My two gudgeons had dissapeared into this pvc tube I got them. It had been near 48 hours since they went in there and I was concerned. I took a flashlight and looked inside, I thought I saw one of them as white as snow. I pulled the tube out closer to my eyes and looked inside it. Both of them were in there (fine) to my relief, so I put the tube back down into the sand. A few minutes later the lady gudgeon came out with her show colors and a minute later followed by the male who was as black as night around his phermone head hump. Soon they both went back into the tube.