with his tank light on but the room lights off he sees his reflection in every surface of the glass, leading him to flare all over the place. it's actually pretty common, and a decent substitute if you don't have a mirror small enough to move around his tank for him.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger-all down here on Earth.
Loki/Grendel/Gail/Beowulf/Camilla/River/Bathory/Arwen/Lafayette/Deb/Jack Skellington (soon)