[Octoman]

Carl, I have the 5600 (very similar to the 5200) and I discovered I get the best pics on the "sports" setting. The sports setting keeps it on a high shutter speed so the pictures don't get blurry and it does pretty well with lower light if I don't zoom in too much.

I can also get pretty good pictures on a tripod with the standard picture setting and no flash, but if the subject moves at all, it comes out blurry, and things tend to move around in the tank a lot...