love the title. been staring at it , and i think what throws it off for me is that the rocks are in focus. i would like to have seen a little blur on everything since the other two don't have much focus. the color would have carried everything that way - because you do have a lot of beautiful color in this!
It almost works but the blacks on the images need to be much stronger - The top left image has too little contrast - If it had more punch those fish would have stood out in the lower part.
It's a really nice idea to try to capture life in a water tank but the rocks are the only items of focus. Try to increase the shutter speed a bit to capture the fish swimming. I don't know what type of camera your using, but keep trying. It's a good idea!
Shooting a fish tank is really hard. Nothin stays still and you usually have to bump up the ISO to get vibrant images. These didn't really work for me only because it seems nothing is in focus. IMHO