Interesting. Looks like you used on-camera flash for all of these, right? If you like to do this kind of thing you should probably set up some off-camera lighting, or bouncing your flash around in different ways.
bwahahahahahaha, yep... we ran a drill in the fish tank!
Tomorrow I'm buying a few 5500K bulbs for some desk lamps and rather than taking pictures at 1/250s with a ~1/1000s flash pulse, I'll try very bright lights and 1/8000s shutter speed.