Got a Sony RX100 for my wife, and decided to try it out on the fish tank. Here are a few shots.
Young Copadichromis borleyi "croc rock" beginning to color up

Protomelas spilonotus "mara rock" - true mara rock - slowly working on coloring up

Protomelas spilonotus "mara rock" - female

Placidochromis phenochilus "tanzania"

Aulonocara baenschi (and others)

If anyone has this camera and can give me some pointers on what settings I should be using, that'd be great.