I think we have a sheep-fish...

Has anyone ever seen Babe? Or I guess, more importantly, has anyone read 'The Sheep Pig' by Dick King-Smith? Today something odd happened. Much like the chicken moment on Babe, our fishies decided to sort themselves into colour order! It was really funny so I took some pictures through the glass. I know that shoaling is normal fish-scu-lar (new word of the day) behaviour but I was delighted with the resulting look. Simple things...